What could cause java lang reflect InvocationTargetException

Question

Well  I ve tried to understand and read what could cause it but I just can t get it   I have this somewhere in my code    try       m invoke testObject          catch AssertionError e           catch Exception e            Thing is that  when it tries to invoke some method it throws  InvocationTargetException instead of some other expected exception  specifically ArrayIndexOutOfBoundsException    As I actually know what method is invoked I went straight to this method code and added a try-catch block for the line that suppose to throw  ArrayIndexOutOfBoundsException and it really threw ArrayIndexOutOfBoundsException as expected  Yet when going up it  somehow changes to InvocationTargetException and in the code above catch Exception e    e is InvocationTargetException and not ArrayIndexOutOfBoundsException  as expected   What could cause such a behavior or how can I check such a thing

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From the Javadoc of Method invoke       Throws  InvocationTargetException - if the underlying method throws an exception     This exception is thrown if the method called threw an exception

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Use the getCause   method on the InvocationTargetException to retrieve the original exception

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I was facing the same problem  I used e getCause   getCause   then I found that it was because of wrong parameters I was passing  There was nullPointerException in fetching the value of one of the parameters  Hope this will help you

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The exception is thrown if     InvocationTargetException - if the underlying method throws an exception    So if the method  that has been invoked with reflection API  throws an exception  runtime exception for example   the reflection API will wrap the exception into an InvocationTargetException

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You ve added an extra level of abstraction by calling the method with reflection  The reflection layer wraps any exception in an InvocationTargetException  which lets you tell the difference between an exception actually caused by a failure in the reflection call  maybe your argument list wasn t valid  for example  and a failure within the method called   Just unwrap the cause within the InvocationTargetException and you ll get to the original one

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This will print the exact line of code in the specific method  which when invoked  raised the exception   try           try code            m invoke testObject             catch  InvocationTargetException e            Answer      e getCause   printStackTrace      catch  Exception e            generic exception handling     e printStackTrace

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The error vanished after I did  Clean- Run xDoclet- Run xPackaging   In my workspace  in ecllipse

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You can compare with the original exception Class using getCause   method like this    try          catch Exception e      if e getCause   getClass   equals AssertionError class             handle your exception  1      else            handle the rest of the world exception

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List all jar files from the Eclipse Navigator mode Verify that all the jar files are in binary mode

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I had a java lang reflect InvocationTargetException error from a statement calling a logger object in an external class inside a try   catch block in my class   Stepping through the code in the Eclipse debugger  amp  hovering the mouse over the logger statement I saw the logger object was null  some external constants needed to be instantiated at the very top of my class

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That InvocationTargetException is probably wrapping up your ArrayIndexOutOfBoundsException  There is no telling upfront when using reflection what that method can throw -- so rather than using a throws Exception approach  all the exceptions are being caught and wrapped up in InvocationTargetException

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This exception is thrown if the underlying method method called using Reflection  throws an exception   So if the method  that has been invoked by reflection API  throws an exception  as for example runtime exception   the reflection API will wrap the exception into an InvocationTargetException

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This describes something like      InvocationTargetException is a checked exception that wraps an   exception thrown by an invoked method or constructor  As of release   1 4  this exception has been retrofitted to conform to the general purpose exception-chaining mechanism  The  target exception  that is   provided at construction time and accessed via the   getTargetException   method is now known as the cause  and may be   accessed via the Throwable getCause   method  as well as the   aforementioned  legacy method

[java] What could cause java.lang.reflect.InvocationTargetException?

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