indexoutofboundsexception

I got a problem with an IndexOutOfBoundsException while I want to update a ListView in JavaFX. What I need to do I have a ListView with elements that correspond to a small simulation. With a click on one list-element the graphical simulation updates based on the click a element of the ListView . Afterwards the ListView needs a update and other elements will be shown. That means all old elements will be removed and only the new ones will be shown. My code looks like that: public void init() { // simCont.initSimulation() returns ArrayList ObservableList<Default> obsDefaultList = FXCollections

I'm guessing I'm getting this error because the string is trying to substring a null value. But wouldn't the ".length() > 0" part eliminate that issue? Here is the Java snippet: if (itemdescription.length() > 0) { pstmt2.setString(3, itemdescription.substring(0,38)); } else { pstmt2.setString(3, "_"); } I got this error: java.lang.StringIndexOutOfBoundsException: String index out of range: 38 at java.lang.String.substring(Unknown Source) at MASInsert2.itemimport(MASInsert2.java:192) at MASInsert2.processRequest(MASInsert2.java:125) at MASInsert2.doGet(MASInsert2.java:219) at javax.servlet.http

I'm trying to use a SimpleCursorAdapter with a ViewBinder to get an image from the database and put it into my ListView item view. Here is my code: private void setUpViews() { mNewsView = (ListView) findViewById(R.id.news_list); Cursor cursor = getNews(); SimpleCursorAdapter curAdapter = new SimpleCursorAdapter( getApplicationContext(), R.layout.cursor_item, cursor, new String[] { "title", "content", "image" }, new int[] { R.id.cursor_title, R.id.cursor_content, R.id.news_image }); ViewBinder viewBinder = new ViewBinder() { public boolean setViewValue(View view, Cursor cursor, int columnIndex)

I have an app with tons of downloads and I'm receiving a lot of this error: 16783 AndroidRuntime E java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0 16783 AndroidRuntime E at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:257) 16783 AndroidRuntime E at java.util.ArrayList.get(ArrayList.java:311) 16783 AndroidRuntime E at android.widget.HeaderViewListAdapter.isEnabled(HeaderViewListAdapter.java:16 4) 16783 AndroidRuntime E at android.widget.ListView.dispatchDrawWithExcessScroll_Default(ListView.java:3 288) 16783 AndroidRuntime E at android.widget.ListView

How do I get up to the first n characters of a string in Java without doing a size check first (inline is acceptable) or risking an IndexOutOfBoundsException ? Here's a neat solution: String upToNCharacters = s.substring(0, Math.min(s.length(), n)); Opinion: while this solution is "neat", I think it is actually less readable than a solution that uses if / else in the obvious way. If the reader hasn't seen this trick, he/she has to think harder to understand the code. IMO, the code's meaning is more obvious in the if / else version. For a cleaner / more readable solution, see @paxdiablo's

Right now, I have a program containing a piece of code that looks like this: while (arrayList.iterator().hasNext()) { //value is equal to a String value if( arrayList.iterator().next().equals(value)) { // do something } } Am I doing that right, as far as iterating through the ArrayList goes? The error I am getting is: java.lang.ArrayIndexOutOfBoundsException: -1 at java.util.ArrayList.get(Unknown Source) at main1.endElement(main1.java:244) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(Unknown Source) at com.sun.org.apache.xerces.internal.impl

When I use this code without <p:tab> it works as expected, <h:form> <p:wizard> <p:tab title="Test-1"> <h:form> <p:growl id="msg"/> <p:selectOneMenu value="#{studentController.departmentIDgenerate}"> <f:selectItems value="#{departmentController.departmentList}" var="deparet" itemLabel="#{deparet.departmentName}" itemValue="#{deparet.departmentId}"/> <p:ajax listener="#{studentController.addMessage}" update="msg"/> </p:selectOneMenu> </h:form> </p:tab> <p:tab title="Test-2"> </p:tab> </p:wizard> </h:form> but when I start using <p:tab> , it throws the below exception: java.lang