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USChristian
 

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    1. PO
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    2. POSpecification and correct use of (boolean) URI matrix parameters (and making them optional when using CXF/JAXB)?
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    3. POWith double-checked locking, does a put to a volatile ConcurrentHashMap have happens-before guarantee?
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    1. POInstantiating abstract classes in Java: Why does this work?
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    2. POWhy use Thread.currentThread().isInterrupted() instead of Thread.interrupted() when implementing Runnable?
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    3. POHow to (reliably) interrupt threads form the main thread after a specific amount of time in Java?
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      1. POHappens-before relationships with volatile fields and synchronized blocks in Java - and their impact on non-volatile variables?
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    1. CO@Raedwald: You might have a point there. I did not run the last tests myself and was told we have a NullPointer, but what I just saw in our source code was a check if that line returns null. We did get unexplainable SocketExceptions that only occurred while running on the environment and under load. I will try to run the test again once the environment is back, to verify if there really is a NullPointerException... But then again, I was more interested in general strategies; our current problem was merely the reason I am interested in them...
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      1. POStrategies for tracking down the root cause of NullPointerExceptions in Java?
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    2. CO@MarkusKull: in every thread's equivalent to the run method, we do this: `httpResponse = httpClient.execute(httpPost, new BasicHttpContext());` It's httpResponse that now sometimes holds `null`. `httpClient` is created in a thread-safe way and shared across all threads.
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      1. POStrategies for tracking down the root cause of NullPointerExceptions in Java?
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    3. CO@Raedwald: The exception gets thrown in a library used in a Java app that gets imported into a service. The framework this runs on does return exceptions at the service level, but the problem occurred 3 levels down, where I cannot access output easily and running the app locally w/o the platform does produce different results (as the service platform is responsible for spawning up threads). I don't have access to the service platform's source code, complicating things further. We pinned it down to the execute method sometimes returning null, and I thought I'd ask to determine what to do next.
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      1. POStrategies for tracking down the root cause of NullPointerExceptions in Java?
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