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POException : java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
 

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    <p>I'm trying to instantiate a Java bean, however it throws </p> <pre><code>java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 at java.util.ArrayList.rangeCheck(ArrayList.java:604) at java.util.ArrayList.get(ArrayList.java:382) at com.application.jsf.BooksTable.getLastId(BooksTable.java:54) at com.application.jsf.BooksManager.&lt;init&gt;(BooksManager.java:24) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:525) at java.lang.Class.newInstance0(Class.java:374) at java.lang.Class.newInstance(Class.java:327) at com.sun.faces.mgbean.BeanBuilder.newBeanInstance(BeanBuilder.java:188) ... 55 more </code></pre> <p>Here's the relevant code of <code>BooksManager</code> class:</p> <pre><code>private BooksTable booksTable; private BookGenerator bookGenerator; public BooksManager() { booksTable = new BooksTable(); bookGenerator = new BookGenerator(booksTable.getLastId()); } </code></pre> <p>And the <code>BooksTable</code> class:</p> <pre><code>private ArrayList&lt;BookBean&gt; booksList; private int BOOKS_ON_PAGE = 10; BooksTable(){ this.booksList = new ArrayList&lt;BookBean&gt;(); } public int getLastId(){ if(this.booksList == null){ return -1; } return this.booksList.get(this.booksList.size()).getBookId(); } </code></pre> <p>How is this caused and how can I solve it?</p>
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    1. COYou got `Caused by: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0`. This has nothing to do with JSF at all. The exception is from `java.lang` package which indicates a basic Java SE problem. In the future, please pay more carefully attention to it. Isolate the problem in a plain Java application with `main()` method without all that JSF code noise. I've at least removed the irrelevant JSF noise from the question so that it's easier salvagable.
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