[jira] [Created] (HDFS-3579) libhdfs: fix "WARNING in native method: JNI call made with exception pending" in errnoFromException

["Colin Patrick McCabe (JIRA)" <ji...@apache.org>]

Colin Patrick McCabe created HDFS-3579:
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             Summary: libhdfs: fix "WARNING in native method: JNI call made with exception pending" in errnoFromException
                 Key: HDFS-3579
                 URL: https://issues.apache.org/jira/browse/HDFS-3579
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: libhdfs
    Affects Versions: 2.0.1-alpha
            Reporter: Colin Patrick McCabe
            Assignee: Colin Patrick McCabe
            Priority: Minor
             Fix For: 2.0.1-alpha


Running a libhdfs test program with -Xcheck:jni reveals some problems.

{code}
WARNING in native method: JNI call made with exception pending
WARNING in native method: JNI call made with exception pending
WARNING in native method: JNI call made with exception pending
WARNING in native method: JNI call made with exception pending
WARNING in native method: JNI call made with exception pending
Exception in thread "main" java.io.IOException: ...
{code}

The problem seems to be that in errnoFromException, we are calling classNameOfObject and some other JNI methods prior to clearing the pending exception.  It should be simple enough to avoid doing this.

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