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From GitBox <...@apache.org>
Subject [GitHub] [pulsar] phreed opened a new issue #5726: Unhandled NoClassDefFoundError in SourceConfigUtils.java (and friends)
Date Fri, 22 Nov 2019 22:46:30 GMT
phreed opened a new issue #5726: Unhandled NoClassDefFoundError in SourceConfigUtils.java (and
friends)
URL: https://github.com/apache/pulsar/issues/5726
 
 
   **Describe the bug**
   
   I am running a custom LocalRunner under the control of Gradle.
   There is a problem in SourceConfigUtils::validate()
   When the jarClassLoader is used a ClassNotFoundException is caught.
   The catch results in using the narClassLoader which would succeed. 
   But instead a  NoClassDefFoundError is produced for which there is no catch and consequently
the narClassLoader is not used.
   
   **To Reproduce**
   
   It is not entirely clear to me why NoClassDefFoundError is sometimes the thrown exception.
   The issue is that it is not an unreasonable exception to expect when a classloader is
   unable to find a particular class.
   
   **Expected behavior**
   
   The nar file does not have its sub-dependancies in the top level but in the bundled-dependencies.
   I expect it to not find the PushSource when read as a jar file and then process the file
as a NAR.
   The fact that the class is not found is as expected.
   
   **Operating Environment:**
   
    - run a gradle task
   
   **Additional context**
   
   I have done some noodling around and have found that the narClassLoader would have succeeded
had it been used.
   https://github.com/apache/pulsar/blob/413aa74ed68557284d6f4502456b3bef2dbd9618/pulsar-functions/utils/src/main/java/org/apache/pulsar/functions/utils/SourceConfigUtils.java#L282-L299
   The following is a trivial (but repetitive) fix that has worked for  me.
   
                   try {
                       typeArg = getSourceType(sourceClassName, jarClassLoader);
                       classLoader = jarClassLoader;
                   } 
                   catch (ClassNotFoundException e) {
                       // class not found in JAR try loading as a NAR and searching for the
class
                       if (narClassLoader != null) {
                           try {
                               typeArg = getSourceType(sourceClassName, narClassLoader);
                               classLoader = narClassLoader;
                           } catch (ClassNotFoundException e1) {
                               throw new IllegalArgumentException(
                                       String.format("Source class %s must be in class path",
sourceClassName), e1);
                           }
                       } else {
                           throw new IllegalArgumentException(
                                   String.format("Source class %s must be in class path",
sourceClassName), e);
                       }
                  } 
                  catch (NoClassDefFoundError e) {
                       // class not found in JAR try loading as a NAR and searching for the
class
                       if (narClassLoader != null) {
                           try {
                               typeArg = getSourceType(sourceClassName, narClassLoader);
                               classLoader = narClassLoader;
                           } catch (ClassNotFoundException e1) {
                               throw new IllegalArgumentException(
                                       String.format("Source class %s must be in class path",
sourceClassName), e1);
                           }
                       } else {
                           throw new IllegalArgumentException(
                                   String.format("Source class %s must be in class path",
sourceClassName), e);
                       }
                   }
   

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