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From "Gary Gregory (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (BCEL-304) ClassPath.getClassFile does not work with JDK 9 and higher
Date Sat, 28 Jul 2018 05:02:00 GMT

     [ https://issues.apache.org/jira/browse/BCEL-304?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gary Gregory resolved BCEL-304.
-------------------------------
       Resolution: Fixed
         Assignee: Gary Gregory
    Fix Version/s: 6.3

I applied a quite reworked version of the patch and changed this ticket description to say
"JDK" instead of "Java". Dealing with a JRE will be in a new ticket.

> ClassPath.getClassFile does not work with JDK 9 and higher
> ----------------------------------------------------------
>
>                 Key: BCEL-304
>                 URL: https://issues.apache.org/jira/browse/BCEL-304
>             Project: Commons BCEL
>          Issue Type: Bug
>          Components: Main
>    Affects Versions: 6.2
>            Reporter: Ed Pavlak
>            Assignee: Gary Gregory
>            Priority: Major
>             Fix For: 6.3
>
>
> When trying to get the class file for Java classes (ie. java.lang.String), an IOException
is thrown:
> Exception in thread "main" java.io.IOException: Couldn't find: java.lang.String.class
>  at org.apache.bcel.util.ClassPath.getClassFile(ClassPath.java:279)
>  at org.apache.bcel.util.ClassPath.getClassFile(ClassPath.java:301)
>  at bcel.test.GetClassFileTest.main(GetClassFileTest.java:12)
>  
> The root cause appears to be the restructuring of Java starting with Java 9. Specifically,
the removal of the rt.jar. The above excpetion can be reproduced using a simple application:
> package bcel.test;
> import java.io.IOException;
> import org.apache.bcel.util.ClassPath;
> public class GetClassFileTest {
>    public static void main(String[] args) throws IOException {
>       String className = "java.lang.String";
>       System.out.println("Looking up ClassPath.ClassFile for: " + className);
>       ClassPath.ClassFile classFile = ClassPath.SYSTEM_CLASS_PATH.getClassFile(className);
>       if (classFile != null) {
>          System.out.println("Class file base: " + classFile.getBase());
>          System.out.println("Class file path: " + classFile.getPath());
>       }
>    }
> }
>  
> Running this on Java 8 produces the following output, whereas running it on Java 9+ produces
the IOException:
> Class file base: C:\jdk1.8.0_161\jre\lib\rt.jar
> Class file path: java/lang/String.class



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