java.lang.NoSuchFieldError：使用yuicompressor缩小JS文件的实例异常

Question

We are in the process of upgrading out application servers from Weblogic 11g running java 1.6 to Weblogic 12c running java 1.8. One of the steps in our ANT build process is to use YUI Compressor (version 2.4.8) to minify our CSS and JS files. The step to minify CSS files works fine. But when we try to minify JS files we get the following error:

java.lang.NoSuchFieldError: instance
    at org.mozilla.javascript.CompilerEnvirons.<init>(CompilerEnvirons.java:48)
    at com.yahoo.platform.yui.compressor.JavaScriptCompressor.parse(JavaScriptCompressor.java:310)
    at com.yahoo.platform.yui.compressor.JavaScriptCompressor.<init>(JavaScriptCompressor.java:533)
    at com.yahoo.platform.yui.compressor.YUICompressTask.doCompression(YUICompressTask.java:202)
    at com.yahoo.platform.yui.compressor.YUICompressTask.execute(YUICompressTask.java:101)
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
    at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    at org.apache.tools.ant.Task.perform(Task.java:348)
    at org.apache.tools.ant.Target.execute(Target.java:357)
    at org.apache.tools.ant.Target.performTasks(Target.java:385)
    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
    at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
    at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
    at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
    at org.apache.tools.ant.Main.runBuild(Main.java:758)
    at org.apache.tools.ant.Main.startAnt(Main.java:217)
    at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)
    at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)

When I looked into the classes inside yuicompressor-2.4.8.jar causing the error I see that line 48 of CompilerEnvirons.java looks like this:

this.errorReporter = DefaultErrorReporter.instance;

But when I checked the class DefaultErrorReporter.java it's empty. The entire class consists of the following:

class 
{
}

Java 1.6 didn't seem to care about this but java 1.8 does.

I'm not an expert with this compressor tool by any means so I was wondering if anyone had any ideas on what might cause this. If I need to provide additional information I'm happy to.

Thanks.

Answer 1

结果证明这是一个损坏的JAR文件。