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  1. JDK
  2. JDK-8161269

Regression in behavior of a null parent ClassLoader

    Details

    • Subcomponent:
    • CPU:
      x86
    • OS:
      linux_ubuntu, os_x

      Description

      FULL PRODUCT VERSION :
      [bin 698]$ $JAVA9_HOME/bin/java -version
      java version "9-ea"
      Java(TM) SE Runtime Environment (build 9-ea+126)
      Java HotSpot(TM) 64-Bit Server VM (build 9-ea+126, mixed mode)


      ADDITIONAL OS VERSION INFORMATION :
      [tmp 513]$ uname -a
      Darwin Scotts-iMac.local 15.5.0 Darwin Kernel Version 15.5.0: Tue Apr 19 18:36:36 PDT 2016; root:xnu-3248.50.21~8/RELEASE_X86_64 x86_64



      A DESCRIPTION OF THE PROBLEM :
      A ClassLoader with a null parent ClassLoader appears to only have visibility into the java.base module. In Java 8 and earlier, such a ClassLoader would have visibility to all of the classes comprising the Java platform.

      REGRESSION. Last worked in version 8u92

      ADDITIONAL REGRESSION INFORMATION:
      [bin 698]$ $JAVA9_HOME/bin/java -version
      java version "9-ea"
      Java(TM) SE Runtime Environment (build 9-ea+126)
      Java HotSpot(TM) 64-Bit Server VM (build 9-ea+126, mixed mode)

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      There is a complete sample app showing the problem available at https://github.com/RedHatJava9Testing/URLClassLoader.git.

      1. git clone https://github.com/RedHatJava9Testing/URLClassLoader.git
      2. cd URLClassLoader
      3. $JAVA9_HOME/bin/javac -d bin src/*.java
      4. [URLClassLoader 525]$ $JAVA9_HOME/bin/java -cp bin TestURLClassLoader
      myModule=unnamed module @1efbd816, layer=null, md=null
      myModule.classLoader=jdk.internal.loader.ClassLoaders$AppClassLoader@4b6995df, parent=jdk.internal.loader.ClassLoaders$PlatformClassLoader@66048bfd
      rootURL=file:/Users/starksm/workspace/URLClassLoader/bin/
      Loaded class: class JavaSqlUser, loader=java.net.URLClassLoader@402f32ff
      JavaSqlUser.init, SqlDateUser.module:unnamed module @6d8a00e3, loader: java.net.URLClassLoader@402f32ff
      Exception in thread "main" java.lang.reflect.InvocationTargetException
      at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(java.base@9-ea/Native Method)
      at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(java.base@9-ea/NativeConstructorAccessorImpl.java:62)
      at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(java.base@9-ea/DelegatingConstructorAccessorImpl.java:45)
      at java.lang.reflect.Constructor.newInstance(java.base@9-ea/Constructor.java:453)
      at TestURLClassLoader.main(TestURLClassLoader.java:24)
      Caused by: java.lang.NoClassDefFoundError: java/sql/Date
      at SqlDateUser.<init>(SqlDateUser.java:7)
      at JavaSqlUser.<init>(JavaSqlUser.java:10)
      ... 5 more
      Caused by: java.lang.ClassNotFoundException: java.sql.Date
      at java.net.URLClassLoader.findClass(java.base@9-ea/URLClassLoader.java:384)
      at java.lang.ClassLoader.loadClass(java.base@9-ea/ClassLoader.java:486)
      at java.lang.ClassLoader.loadClass(java.base@9-ea/ClassLoader.java:419)
      ... 7 more


      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      If you checkout the java8 branch, compile and run with a Java8 jdk you get the expected result:

      1. git checkout java8
      2. $JAVA8_HOME/bin/javac -d bin src/*.java
      3. $JAVA8_HOME/bin/java -cp bin TestURLClassLoader
      rootURL=file:/Users/starksm/workspace/URLClassLoader/bin/
      Loaded class: class JavaSqlUser, loader=java.net.URLClassLoader@677327b6
      Loaded instance: JavaSqlUser(SqlDateUser@7f31245a)

      ACTUAL -
      Exception in thread "main" java.lang.reflect.InvocationTargetException
      at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(java.base@9-ea/Native Method)
      at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(java.base@9-ea/NativeConstructorAccessorImpl.java:62)
      at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(java.base@9-ea/DelegatingConstructorAccessorImpl.java:45)
      at java.lang.reflect.Constructor.newInstance(java.base@9-ea/Constructor.java:453)
      at TestURLClassLoader.main(TestURLClassLoader.java:24)
      Caused by: java.lang.NoClassDefFoundError: java/sql/Date
      at SqlDateUser.<init>(SqlDateUser.java:7)
      at JavaSqlUser.<init>(JavaSqlUser.java:10)
      ... 5 more
      Caused by: java.lang.ClassNotFoundException: java.sql.Date
      at java.net.URLClassLoader.findClass(java.base@9-ea/URLClassLoader.java:384)
      at java.lang.ClassLoader.loadClass(java.base@9-ea/ClassLoader.java:486)
      at java.lang.ClassLoader.loadClass(java.base@9-ea/ClassLoader.java:419)
      ... 7 more


      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      Available at https://github.com/RedHatJava9Testing/URLClassLoader.git
      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      To achieve the same behavior as seen under Java8, one has to pass the new ClassLoader.getPlatformClassLoader() value as the parent ClassLoader rather than null.

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            • Assignee:
              alanb Alan Bateman
              Reporter:
              webbuggrp Webbug Group
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              Dates

              • Created:
                Updated:
                Resolved: