java.lang.NoClassDefFoundError: scala/Function2

Apache's JIRA Issue Tracker | Mark S | 2 years ago
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  1. 0
    samebug tip
    This error means there's a class missing in your classpath during runtime. You need to create a jar with all your dependencies and have it in your classpath. Check Maven Assembly Plugin and how to add your dependencies to a jar: https://goo.gl/U2zr8k
  2. 0

    I am currently trying to run the Hello Samza example (http://samza.apache.org/startup/hello-samza/0.9/) and unfortunately when I try to run a Samza job I get the following exception: *Command* {code} deploy/samza/bin/run-job.sh --config-factory=org.apache.samza.config.factories.PropertiesConfigFactory --config-path=file://$PWD/deploy/samza/config/wikipedia-feed.properties {code} *Exception* {code} ... Error: A JNI error has occurred, please check your installation and try again Exception in thread "main" java.lang.NoClassDefFoundError: scala/Function2 at java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) at java.lang.Class.privateGetMethodRecursive(Class.java:3048) at java.lang.Class.getMethod0(Class.java:3018) at java.lang.Class.getMethod(Class.java:1784) at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526) Caused by: java.lang.ClassNotFoundException: scala.Function2 at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 7 more {code} If I edit vim deploy/samza/bin/run-class.sh and manually add the scala-library.jar to the CLASSPATH value, this error disappears, though the Hadoop Application will fail with a similarish exception (http://localhost:8088/). {code} Error: A JNI error has occurred, please check your installation and try again Exception in thread "main" java.lang.NoClassDefFoundError: scala/collection/immutable/List at java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) at java.lang.Class.privateGetMethodRecursive(Class.java:3048) at java.lang.Class.getMethod0(Class.java:3018) at java.lang.Class.getMethod(Class.java:1784) at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526) Caused by: java.lang.ClassNotFoundException: scala.collection.immutable.List at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 7 more {code} The following links might be related: * https://samza.apache.org/learn/tutorials/0.9/run-in-multi-node-yarn.html * https://issues.apache.org/jira/browse/SAMZA-456

    Apache's JIRA Issue Tracker | 2 years ago | Mark S
    java.lang.NoClassDefFoundError: scala/Function2
  3. 0

    I am currently trying to run the Hello Samza example (http://samza.apache.org/startup/hello-samza/0.9/) and unfortunately when I try to run a Samza job I get the following exception: *Command* {code} deploy/samza/bin/run-job.sh --config-factory=org.apache.samza.config.factories.PropertiesConfigFactory --config-path=file://$PWD/deploy/samza/config/wikipedia-feed.properties {code} *Exception* {code} ... Error: A JNI error has occurred, please check your installation and try again Exception in thread "main" java.lang.NoClassDefFoundError: scala/Function2 at java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) at java.lang.Class.privateGetMethodRecursive(Class.java:3048) at java.lang.Class.getMethod0(Class.java:3018) at java.lang.Class.getMethod(Class.java:1784) at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526) Caused by: java.lang.ClassNotFoundException: scala.Function2 at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 7 more {code} If I edit vim deploy/samza/bin/run-class.sh and manually add the scala-library.jar to the CLASSPATH value, this error disappears, though the Hadoop Application will fail with a similarish exception (http://localhost:8088/). {code} Error: A JNI error has occurred, please check your installation and try again Exception in thread "main" java.lang.NoClassDefFoundError: scala/collection/immutable/List at java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) at java.lang.Class.privateGetMethodRecursive(Class.java:3048) at java.lang.Class.getMethod0(Class.java:3018) at java.lang.Class.getMethod(Class.java:1784) at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526) Caused by: java.lang.ClassNotFoundException: scala.collection.immutable.List at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 7 more {code} The following links might be related: * https://samza.apache.org/learn/tutorials/0.9/run-in-multi-node-yarn.html * https://issues.apache.org/jira/browse/SAMZA-456

    Apache's JIRA Issue Tracker | 2 years ago | Mark S
    java.lang.NoClassDefFoundError: scala/Function2
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    compile the code, not work well

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Root Cause Analysis

  1. java.lang.ClassNotFoundException

    scala.Function2

    at java.net.URLClassLoader.findClass()
  2. Java RT
    LauncherHelper.checkAndLoadMain
    1. java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    2. java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    3. sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    4. java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    5. java.lang.Class.getDeclaredMethods0(Native Method)
    6. java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
    7. java.lang.Class.privateGetMethodRecursive(Class.java:3048)
    8. java.lang.Class.getMethod0(Class.java:3018)
    9. java.lang.Class.getMethod(Class.java:1784)
    10. sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
    11. sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
    11 frames