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Tại sao lại xảy ra lỗi IndexOutofbounds trong Java? – Deft Blog
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- Summary of article content: Articles about Tại sao lại xảy ra lỗi IndexOutofbounds trong Java? – Deft Blog Exception in thread “main” java.lang.IndexOutOfBoundsException: Index: 2, Size: 2. at java.util.ArrayList.rangeCheck(ArrayList.java:653). …
- Most searched keywords: Whether you are looking for Tại sao lại xảy ra lỗi IndexOutofbounds trong Java? – Deft Blog Exception in thread “main” java.lang.IndexOutOfBoundsException: Index: 2, Size: 2. at java.util.ArrayList.rangeCheck(ArrayList.java:653). Mỗi phần tử sẽ tương ứng với một chỉ số, chỉ số này là một số nguyên có giá trị trong khoảng [0, n -1]
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Deft Blog
Xử lý exception
IndexOutOfBoundsException (Java Platform SE 7 )
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java – What is a StringIndexOutOfBoundsException? How can I fix it? – Stack Overflow
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- Summary of article content: Articles about java – What is a StringIndexOutOfBoundsException? How can I fix it? – Stack Overflow IndexOutOfBoundsException is a sub of RuntimeException mean it is an unchecked exception which is thrown to indicate that an index of some sort (such … …
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1 Answer
1
What is IndexOutOfBoundsException
Class Constructor usage with index or string message
Which are other variationssub-classes of IndexOutOfBoundsException
Why these exception occur
Your Answer
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IndexOutOfBoundsException | Android Developers
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- Summary of article content: Articles about IndexOutOfBoundsException | Android Developers Thrown to indicate that an index of some sort (such as to an array, to a string, or to a vector) is out of range. Applications can sub this … …
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Public constructors
Java Exception Handling – IndexOutOfBoundsException
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- Most searched keywords: Whether you are looking for Java Exception Handling – IndexOutOfBoundsException The IndexOutOfBoundsException is thrown when attempting to access an inval index within a collection, such as an array , vector , string … A close look at the Java IndexOutOfBoundsException, with code samples showing how to use this exception in built-in APIs and custom classes.
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The Technical Rundown
Full Code Sample
When Should You Use It
IndexOutOfBoundsException Class (Java.Lang) | Microsoft Docs
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- Summary of article content: Articles about IndexOutOfBoundsException Class (Java.Lang) | Microsoft Docs Thrown to indicate that an index of some sort (such as to an array, to a string, or to a vector) is out of range. In this article. …
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Java.lang.indexoutofboundsexception là gì? – Máy tính
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Làm cách nào để sửa lỗi javalangindexoutofboundsexception
Tại sao tôi gặp lỗi javalangindexoutofboundsexception
Tôi có thể tìm trợ giúp để sửa lỗi javalangindexoutofboundsexception ở đâu
Làm cách nào để ngăn chặn lỗi ngoại lệ javalang lang index ngoài giới hạn trong tương lai
6 Cách tốt nhất để sửa chỉ mục java lang nằm ngoài giới hạn ngoại lệ là gì
nội dung nóng
IndexOutOfBoundsException (Java SE 12 )
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IndexOutOfBoundsException
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PH20373: JAVA.LANG.INDEXOUTOFBOUNDSEXCEPTION THROWN FROM COM.IBM.EJS.CONTAINER.BEANO.REASSOCIATEHANDLELIST
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What is a StringIndexOutOfBoundsException? How can I fix it?
Error Message: java.lang.StringIndexOutOfBoundsException: length=28; regionStart=1; regionLength=499 at java.lang.String.substring(String.java:1931) at com.example.my.app.MainActivity$2.onResponse(MainActivity.java:50) at com.example.my.app.MainActivity$2.onResponse(MainActivity.java:46) at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:60) at com.android.volley.toolbox.StringRequest.deliverResponse(StringRequest.java:30) at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6077) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Error Description
There is an IndexOutOfBound exception occurred in your MainActivity class Inside second inner class’s OnResponse function as shown MainActivity$2onResponse on line 46 which basically occurred during substring operation in String.java line 1931 which was invoked from StringRequest.deliverResponse at line 60, which was invoked from StringRequest.deliverResponse at line 30, which was invoked from ExecutorDelivery.java at line 99, which intially started from ZygoteInit$MethodAndArgsCaller’s run function and reached up-to main thread of ActivityThread.main=>looper=>handler
Actual Reason
Your code trying to create a substring with
starting index = 0 ending index = 500
though your actual response string length is = 28, so String length is not long enough to create a substring of 500 characters.
Solutions :
Validate length using ternary operator ?: mTextView.setText(“Response is: “+ ((response.length()>499) ? response.substring(0,500) : “length is too short”)); Note : Ternary operator ( ?: ) is a short expression of if else but it is not a statement mean it cannot occur as an atomic statement as this is INVALID because there is no assignment ((someString.length()>499) ? someString.substring(0,500):”Invalid length”); if-else enhances the visibility String msg=”Invalid Response”; if(response.length()>499){ msg=response.substring(0,500); } mTextView.setText(“Response is: “+msg); //or mTextView.setText(“Response is: “+response);
What is IndexOutOfBoundsException?
IndexOutOfBoundsException is a subclass of RuntimeException mean it is an unchecked exception which is thrown to indicate that an index of some sort (such as to an array, to a string, or to a vector) is out of range.e.g using List.
as shown in the Documentation
List
ls=new ArrayList<>(); ls.add(“a”); ls.add(“b”); ls.get(3); // will throw IndexOutOfBoundsException , list length is 2 Prevention :
String str = “”; int index =3; if(index < ls.size()) // check, list size must be greater than index str = ls.get(index); else // print invalid index or other stuff Class Constructor usage with index or string message public IndexOutOfBoundsException() { super(); } public IndexOutOfBoundsException(String s) { super(s); } Which are other variations/sub-classes of IndexOutOfBoundsException? ArrayIndexOutOfBoundsException : This indicate that an array has been accessed with an illegal index. The index is either negative or greater than or equal to the size of the array for e.g int arr = {1,2,3} int error = arr[-1]; // no negative index allowed int error2 = arr[4]; // arr length is 3 as index range is 0-2 Prevention : int num = ""; int index=4; if(index < arr.length) // check, array length must be greater than index num = arr[index]; else // print invalid index or other stuff StringIndexOutOfBoundsException : This is thrown by String methods to indicate that an index is either negative or greater than the size of the string. For some methods such as the charAt method, this exception also is thrown when the index is equal to the size of the string. String str = "foobar"; // length = 6 char error = str.charAt(7); // index input should be less than or equal to length-1 char error = str.charAt(-1); // cannot use negative indexes Prevention : String name = "FooBar"; int index = 7; char holder = ''; if(index < name.length()) // check, String length must be greater than index holder = name.charAt(index) ; else // print invalid index or other stuff Note: length() is a function of String class and length is a associative field of an array . Why these exception occur? Usage of Negative index with arrays or charAt , substring functions or , functions BeginIndex is less than 0 or endIndex is greater than the length of input string to create substring or beginIndex is larger than the endIndex or endIndex is greater than the length of input string to create or beginIndex is larger than the endIndex When endIndex - beginIndex result is less than 0 result is less than When input string/array is empty INFO : It is job of JVM to create the object of appropriate exception and pass it to the place of , where it occurred using throw keyword like or you can also do it manually using throw keyword too. if (s == null) { throw new IndexOutOfBoundsException("null"); } How can I fix this ? Analyzing StackTrace Validating input string against nullity , length or valid indexes Using Debugging or Logs Using Generic Exception catch block 1.) Analyzing StackTrace As shown at the beginning of this post , stacktrace provides the necessary information in the initial messages about where it happen , why it happen so you can simply trace that code and apply the required solution . for e.g the reason StringIndexOutOfBoundsException and then look for your package name indicating your class file then go to that line and keeping the reason in mind , simply apply the solution It's a head start if you study about the exception and its cause as well in documentation. 2.) Validating input string against nullity , length or valid indexes In case of uncertainty when you don't know about the actual input like response is coming from server (or maybe it's an error or nothing) or user then it's always better to cover all the unexpected cases though believe me few users always like to push the limits of testing so use input!=null && input.length()>0 or for indexes, you can use the ternary operator or if-else boundary check conditions
3.) Using Debugging or Logs
You can test the running environment of your project in debug mode by adding break-points in your project and system will stop there to wait for your next action and meanwhile you can look into the values of variables and other details.
Logs are just like check-points so when your control cross this point they generate details , basically they are informative messages given by wither system or user can also put logging messages using either Logs or Println messages
4.) Using Generic Exception catch block
Try-catch blocks are always useful to handle RuntimeExceptions so you can use multiple catch block along to handle your possible issues and to give appropriate details
try { mTextView.setText(“Response is: “+ response.substring(0,500)); } catch (IndexOutOfBoundsException e) { e.printStackTrace(); System.out,println(“Invalid indexes or empty string”); } catch (NullPointerException e) { // mTextView or response can be null e.printStackTrace(); System.out,println(“Something went wrong ,missed initialization”); } catch (Exception e) { e.printStackTrace(); System.out,println(“Something unexpected happened , move on or can see stacktrace “); }
Further References
What is a NullPointerException, and how do I fix it?
Java Exception Handling – IndexOutOfBoundsException
Moving along through the detailed Java Exception Handling series we’ve been working on, today we’ll be going over the IndexOutOfBoundsException. The IndexOutOfBoundsException is thrown when attempting to access an invalid index within a collection, such as an array , vector , string , and so forth. It can also be implemented within custom classes to indicate invalid access was attempted for a collection.
In this article we’ll explore the IndexOutOfBoundsException by starting with where it resides in the overall Java Exception Hierarchy. We’ll also examine some fully functional Java code samples that will illustrate both the default API invocation of IndexOutOfBoundsExceptions , along with a custom class example of how you might throw them in your own code. Let’s get crackin’!
The Technical Rundown
All Java errors implement the java.lang.Throwable interface, or are extended from another inherited class therein. The full exception hierarchy of this error is:
Full Code Sample
Below is the full code sample we’ll be using in this article. It can be copied and pasted if you’d like to play with the code yourself and see how everything works.
package io.airbrake; import io.airbrake.utility.Logging; import java.util.GregorianCalendar; public class Main { public static void main(String[] args) {
Logging.lineSeparator(“CREATE RANDOM NUMBER ARRAY”);
int[] array = createArrayOfSize(10);
// Output array.
Logging.log(array); Logging.lineSeparator(“GET ELEMENT AT INDEX 5”);
Logging.log(getElementByIndex(array, 5)); Logging.lineSeparator(“GET ELEMENT AT INDEX 10”);
Logging.log(getElementByIndex(array, 10)); Logging.lineSeparator(“CREATE BOOK”);
Book book = new Book(
“A Game of Thrones”,
“George R.R. Martin”,
new GregorianCalendar(1996, 8, 6).getTime(),
“novel”
);
Logging.log(book); Logging.lineSeparator(“INSERT PAGES”);
// Create Pages array.
Page[] pages = {
new Page(““We should start back,” Gared urged as the woods began to grow dark around them. ” +
““The wildlings are dead.””),
new Page(“Until tonight. Something was different tonight. There was an edge to this darkness ” +
“that made his hackles rise.”),
new Page(““Well, no,” Will admitted”)
};
book.setPages(pages);
Logging.log(book); Logging.lineSeparator(“SET PAGE AT INVALID INDEX”);
setPageAtIndex(book, new Page(“Royce nodded.”), 3);
} private static void setPageAtIndex(Book book, Page page, int index) {
try {
// Set page at index.
book.setPage(page, index);
// Output updated book.
Logging.log(book);
} catch (IndexOutOfBoundsException error) {
// Output expected IndexOutOfBoundsExceptions.
Logging.log(error);
} catch (Exception | Error exception) {
// Output unexpected Exceptions/Errors.
Logging.log(exception, false);
}
} private static int[] createArrayOfSize(int size) {
int[] data = new int[size];
for (int i = 0; i < data.length; i++) { data[i] = (int)(Math.random() * 100); } return data; } private static Integer getElementByIndex(int[] array, int index) { try { return array[index]; } catch (IndexOutOfBoundsException error) { // Output expected IndexOutOfBoundsExceptions. Logging.log(error); } catch (Exception | Error exception) { // Output unexpected Exceptions/Errors. Logging.log(exception, false); } return null; } } package io.airbrake; public class Page { private String content; public Page() { } public Page(String content) { setContent(content); } public String getContent() { return content; } public void setContent(String content) { this.content = content; } /** * Gets a string representation of Page. * * @return String Formatted string of Page. */ public String toString() { return getContent(); } } // Book.java package io.airbrake; import java.util.Date; /** * Simple example class to store book instances. */ public class Book { private String author; private String title; private Page[] pages; private Date publishedAt; private static String publicationType = "Book"; private static final Integer maximumPageCount = 4000; /** * Ensure publication type is upper case. */ static { publicationType = publicationType.toUpperCase(); } /** * Constructs an empty book. */ public Book() { } /** * Constructs a basic book. * * @param title Book title. * @param author Book author. */ public Book(String title, String author) { setAuthor(author); setTitle(title); } /** * Constructs a basic book, with page count. * * @param title Book title. * @param author Book author. */ public Book(String title, String author, Page[] pages) { setAuthor(author); setTitle(title); } /** * Constructs a basic book, with page count. * * @param title Book title. * @param author Book author. */ public Book(String title, String author, Date publishedAt) { setAuthor(author); setTitle(title); setPublishedAt(publishedAt); } /** * Constructs a basic book, with page count. * * @param title Book title. * @param author Book author. */ public Book(String title, String author, Date publishedAt, String publicationType) { setAuthor(author); setTitle(title); setPublishedAt(publishedAt); setPublicationType(publicationType); } /** * Get author of book. * * @return Author name. */ public String getAuthor() { return author; } /** * Get current page count. * * @return Page count. */ public int getPageCount() { return pages.length; } /** * Get pages of book. * * @return Pages. */ public Page[] getPages() { return pages; } /** * Get publication type of book. * * @return Publication type. */ public String getPublicationType() { return publicationType; } /** * Get published date of book. * * @return Published date. */ public Date getPublishedAt() { return publishedAt; } /** * Get a formatted tagline with author, title, and page count. * * @return Formatted tagline. */ public String getTagline() { return String.format("'%s' by %s is %d pages.", this.title, this.author, this.getPageCount()); } /** * Get title of book. * * @return Title. */ public String getTitle() { return title; } /** * Publish current book. * If book already published, throws IllegalStateException. */ public void publish() throws IllegalStateException { Date publishedAt = getPublishedAt(); if (publishedAt == null) { setPublishedAt(new Date()); System.out.println(String.format("Published '%s' by %s.", getTitle(), getAuthor())); } else { throw new IllegalStateException( String.format("Cannot publish '%s' by %s (already published on %s).", getTitle(), getAuthor(), publishedAt)); } } /** * Set author of book. * * @param author Author name. */ public void setAuthor(String author) { this.author = author; } /** * Set page at specified index of book. * * @param page Page to be added. * @param index Index of specified page. */ public void setPage(Page page, int index) { if (index < 0 || index >= this.pages.length) {
throw new IndexOutOfBoundsException(String.format(“Unable to add page with content \”%s\” at index %s.”, page, index));
}
this.pages[index] = page;
} /**
* Set pages of book.
*
* @param pages Pages.
*/
public void setPages(Page[] pages) {
this.pages = pages;
} /**
* Set publication type of book.
*
* @param type Publication type.
*/
public void setPublicationType(String type) { this.publicationType = type; } /**
* Set published date of book.
*
* @param publishedAt Page count.
*/
public void setPublishedAt(Date publishedAt) {
this.publishedAt = publishedAt;
} /**
* Set title of book.
*
* @param title Title.
*/
public void setTitle(String title) {
this.title = title;
} /**
* Gets a string representation of Book.
*
* @return String string of Book.
*/
public String toString() {
return String.format(“‘%s’ by %s is %s pgs and published on %s.”,
getTitle(),
getAuthor(),
getPageCount(),
getPublishedAt());
} /**
* Throw an Exception.
*/
public void throwException(String message) throws Exception {
throw new Exception(message);
}
}
// Logging.java
package io.airbrake.utility; import java.util.Arrays; import org.apache.commons.lang3.ClassUtils;
import org.apache.commons.lang3.builder.*; /**
* Houses all logging methods for various debug outputs.
*/
public class Logging {
private static final char separatorCharacterDefault = ‘-‘;
private static final String separatorInsertDefault = “”;
private static final int separatorLengthDefault = 40; /**
* Get a String of passed char of passed length size.
* @param character Character to repeat.
* @param length Length of string.
* @return Created string.
*/
private static String getRepeatedCharString(char character, int length) {
// Create new character array of proper length.
char[] characters = new char[length];
// Fill each array element with character.
Arrays.fill(characters, character);
// Return generated string.
return new String(characters);
} /**
* Outputs any kind of Object.
* Uses ReflectionToStringBuilder from Apache commons-lang library.
*
* @param value Object to be output.
*/
public static void log(Object value)
{
if (value == null) return;
// If primitive or wrapper object, directly output.
if (ClassUtils.isPrimitiveOrWrapper(value.getClass()))
{
System.out.println(value);
}
else
{
// For complex objects, use reflection builder output.
System.out.println(new ReflectionToStringBuilder(value, ToStringStyle.MULTI_LINE_STYLE).toString());
}
} /**
* Outputs any kind of String.
*
* @param value String to be output.
*/
public static void log(String value)
{
if (value == null) return;
System.out.println(value);
} /**
* Outputs passed in Throwable exception or error instance.
* Can be overloaded if expected parameter should be specified.
*
* @param throwable Throwable instance to output.
*/
public static void log(Throwable throwable)
{
// Invoke call with default expected value.
log(throwable, true);
} /**
* Outputs passed in Throwable exception or error instance.
* Includes Throwable class type, message, stack trace, and expectation status.
*
* @param throwable Throwable instance to output.
* @param expected Determines if this Throwable was expected or not.
*/
public static void log(Throwable throwable, boolean expected)
{
System.out.println(String.format(“[%s] %s”, expected ? “EXPECTED” : “UNEXPECTED”, throwable.toString()));
throwable.printStackTrace();
} /**
* See: lineSeparator(String, int, char)
*/
public static void lineSeparator() {
lineSeparator(separatorInsertDefault, separatorLengthDefault, separatorCharacterDefault);
} /**
* See: lineSeparator(String, int, char)
*/
public static void lineSeparator(String insert) {
lineSeparator(insert, separatorLengthDefault, separatorCharacterDefault);
} /**
* See: lineSeparator(String, int, char)
*/
public static void lineSeparator(int length) {
lineSeparator(separatorInsertDefault, length, separatorCharacterDefault);
} /**
* See: lineSeparator(String, int, char)
*/
public static void lineSeparator(int length, char separator) {
lineSeparator(separatorInsertDefault, length, separator);
} /**
* See: lineSeparator(String, int, char)
*/
public static void lineSeparator(char separator) {
lineSeparator(separatorInsertDefault, separatorLengthDefault, separator);
} /**
* See: lineSeparator(String, int, char)
*/
public static void lineSeparator(String insert, int length) {
lineSeparator(insert, length, separatorCharacterDefault);
} /**
* See: lineSeparator(String, int, char)
*/
public static void lineSeparator(String insert, char separator) {
lineSeparator(insert, separatorLengthDefault, separator);
} /**
* Outputs a dashed line separator with
* inserted text centered in the middle.
*
* @param insert Inserted text to be centered.
* @param length Length of line to be output.
* @param separator Separator character.
*/
public static void lineSeparator(String insert, int length, char separator)
{
// Default output to insert.
String output = insert; if (insert.length() == 0) {
output = getRepeatedCharString(separator, length);
} else if (insert.length() < length) { // Update length based on insert length, less a space for margin. length -= (insert.length() + 2); // Halve the length and floor left side. int left = (int) Math.floor(length / 2); int right = left; // If odd number, add dropped remainder to right side. if (length % 2 != 0) right += 1; // Surround insert with separators. output = String.format("%s %s %s", getRepeatedCharString(separator, left), insert, getRepeatedCharString(separator, right)); } System.out.println(output); } } When Should You Use It? Coming across an IndexOutOfBoundsException in standard API code simply means an invalid index was accessed for a collection. To illustrate we have two methods, createArrayOfSize(int size) and getElementByIndex(int[] array, int index) : private static int[] createArrayOfSize(int size) { int[] data = new int[size]; for (int i = 0; i < data.length; i++) { data[i] = (int)(Math.random() * 100); } return data; } private static Integer getElementByIndex(int[] array, int index) { try { return array[index]; } catch (IndexOutOfBoundsException error) { // Output expected IndexOutOfBoundsExceptions. Logging.log(error); } catch (Exception | Error exception) { // Output unexpected Exceptions/Errors. Logging.log(exception, false); } return null; } As you can see, createArrayOfSize(int size) just creates and returns a new int[] array of the specified size, populating elements with random integers. We then use getElementByIndex(int[] array, int index) to attempt to retrieve specific elements of the passed int[] array parameter that correspond with the specified int index parameter. To test this out we'll start by creating a 10-length array, output it to the log, then attempt to retrieve a specific element at index 5 : public class Main { public static void main(String[] args) { Logging.lineSeparator("CREATE RANDOM NUMBER ARRAY"); int[] array = createArrayOfSize(10); // Output array. Logging.log(array); Logging.lineSeparator("GET ELEMENT AT INDEX 5"); Logging.log(getElementByIndex(array, 5)); // ... } } Here's the output we get after executing the above code: ------ CREATE RANDOM NUMBER ARRAY ------ [I@3ada9e37[ {0,38,21,70,77,85,26,7,89,59} ] -------- GET ELEMENT AT INDEX 5 -------- 85 Everything seems to be working as expected. Our initial array contains 10 random integers and the element at index 5 is 85 , as confirmed by the call to getElementByIndex(int[] array, int index) . Now, let's try getting an element at an index outside the bounds of our array ( 10 , in this case): Logging.lineSeparator("GET ELEMENT AT INDEX 10"); Logging.log(getElementByIndex(array, 10)); The output shows we've thrown a specific ArrayIndexOutOfBoundsException , which is an exception class that inherits from IndexOutOfBoundsException : ------- GET ELEMENT AT INDEX 10 -------- [EXPECTED] java.lang.ArrayIndexOutOfBoundsException: 10 That's all well and good, but what happens if we want a more descriptive exception message? We can implement IndexOutOfBoundsExceptions directly into our own custom classes, to be thrown when attempts to access an invalid index would cause problems. For example, we've created a simple Page class that contains a single content field to store the content of the Page : package io.airbrake; public class Page { private String content; public Page() { } public Page(String content) { setContent(content); } public String getContent() { return content; } public void setContent(String content) { this.content = content; } /** * Gets a string representation of Page. * * @return String Formatted string of Page. */ public String toString() { return getContent(); } } We then have a modified Book class that contains a Page[] pages field array, allowing us to specify a series of Page elements associated with the Book . We have methods to both get and set Pages within the Book instance, but the most important method is setPage(Page page, int index) , which allows us to explicitly change the Page element at the specified int index . However, if the passed index is invalid or exceeds the current bounds of our pages field length, we explicitly throw a new IndexOutOfBoundsException indicating the problem: /** * Set page at specified index of book. * * @param page Page to be added. * @param index Index of specified page. */ public void setPage(Page page, int index) { if (index < 0 || index >= this.pages.length) {
throw new IndexOutOfBoundsException(String.format(“Unable to add page with content \”%s\” at index %s.”, page, index));
}
this.pages[index] = page;
}
To test this out we start by instantiating a new Book and adding some content to the first few three pages:
Logging.lineSeparator(“CREATE BOOK”);
Book book = new Book(
“A Game of Thrones”,
“George R.R. Martin”,
new GregorianCalendar(1996, 8, 6).getTime(),
“novel”
);
Logging.log(book); Logging.lineSeparator(“INSERT PAGES”);
// Create Pages array.
Page[] pages = {
new Page(““We should start back,” Gared urged as the woods began to grow dark around them. ” +
““The wildlings are dead.””),
new Page(“Until tonight. Something was different tonight. There was an edge to this darkness ” +
“that made his hackles rise.”),
new Page(““Well, no,” Will admitted”)
};
book.setPages(pages);
Logging.log(book);
This produces the initial Book output without any Pages content, then once we add them via the setPages(Page[] pages) method, the output shows our Pages have been added successfully:
————- CREATE BOOK ————–
io.airbrake.Book@21a06946[
author=George R.R. Martin
title=A Game of Thrones
pages=
publishedAt=Fri Sep 06 00:00:00 PDT 1996
] ————- INSERT PAGES ————-
io.airbrake.Book@21a06946[
author=George R.R. Martin
title=A Game of Thrones
pages={“We should start back,” Gared urged as the woods began to grow dark around them. “The wildlings are dead.”,Until tonight. Something was different tonight. There was an edge to this darkness that made his hackles rise.,“Well, no,” Will admitted}
publishedAt=Fri Sep 06 00:00:00 PDT 1996
]
Cool! Now let’s try this setPageAtIndex(Book, book, Page page, int index) helper method, which is just a wrapper for the Book.setPage(Page page, int index) method:
private static void setPageAtIndex(Book book, Page page, int index) {
try {
// Set page at index.
book.setPage(page, index);
// Output updated book.
Logging.log(book);
} catch (IndexOutOfBoundsException error) {
// Output expected IndexOutOfBoundsExceptions.
Logging.log(error);
} catch (Exception | Error exception) {
// Output unexpected Exceptions/Errors.
Logging.log(exception, false);
}
}
Here we’re passing our previous book instance, a new fourth Page , and an index of 3 (to indicate the fourth page):
Logging.lineSeparator(“SET PAGE AT INVALID INDEX”);
setPageAtIndex(book, new Page(“Royce nodded.”), 3);
Since we explicitly check the validity of the passed int index parameter in Book.setPage(Page page, int index) , this attempt to set a Page for an invalid index throws our custom IndexOutOfBoundsException :
—— SET PAGE AT INVALID INDEX ——-
[EXPECTED] java.lang.IndexOutOfBoundsException: Unable to add page with content “Royce nodded.” at index 3.The Airbrake-Java library provides real-time error monitoring and automatic exception reporting for all your Java-based projects. Tight integration with Airbrake’s state of the art web dashboard ensures that Airbrake-Java gives you round-the-clock status updates on your application’s health and error rates. Airbrake-Java easily integrates with all the latest Java frameworks and platforms like Spring , Maven , log4j , Struts , Kotlin , Grails , Groovy , and many more. Plus, Airbrake-Java allows you to easily customize exception parameters and gives you full, configurable filter capabilities so you only gather the errors that matter most.
Check out all the amazing features Airbrake-Java has to offer and see for yourself why so many of the world’s best engineering teams are using Airbrake to revolutionize their exception handling practices! Discover the power of Airbrake Error Monitoring and try it free for 30 days.
IndexOutOfBoundsException Class (Java.Lang)
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Thrown to indicate that an index of some sort (such as to an array, to a string, or to a vector) is out of range.
Java documentation for java.lang.IndexOutOfBoundsException .
Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.
Constructs an
IndexOutOfBoundsExceptionwith the specified detail message.A constructor used when creating managed representations of JNI objects; called by the runtime.
Constructs an
IndexOutOfBoundsExceptionwith no detail message.Cause Returns the cause of this throwable or null if the cause is nonexistent or unknown. (Inherited from Throwable)
Class (Inherited from Throwable)
Handle The handle to the underlying Android instance. (Inherited from Throwable)
JniIdentityHashCode (Inherited from Throwable)
LocalizedMessage Creates a localized description of this throwable. (Inherited from Throwable)
Message Returns the detail message string of this throwable. (Inherited from Throwable)
PeerReference (Inherited from Throwable)
StackTrace (Inherited from Throwable)
ThresholdClass This API supports the Mono for Android infrastructure and is not intended to be used directly from your code.
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