如何解决Grails编译中的NoClassDefFoundError？

我正在将一个项目从Grails 1.3.7升级到3.2.6。我有导入诸如IMAPFolder和IMAPProtocol之类的类。我相信这需要我将com.sun.mail：imap作为编译时间依赖项。我有这在我的build.gradle：如何解决Grails编译中的NoClassDefFoundError？

compile group: 'com.sun.mail', name: 'imap', version: '1.5.6'

但是，当我补充说，并尝试编译，我得到一个Java编译错误。

General error during conversion: java.lang.NoClassDefFoundError: com/sun/mail/util/ReadableMime 

java.lang.RuntimeException: java.lang.NoClassDefFoundError: com/sun/mail/util/ReadableMime 
     at org.codehaus.groovy.control.CompilationUnit.convertUncaughtExceptionToCompilationError(CompilationUnit.java:1089) 
     at org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:1067) 
     at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:591) 
     at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:569) 
     at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:546) 
     at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:525) 
     at org.gradle.api.internal.tasks.compile.ApiGroovyCompiler.execute(ApiGroovyCompiler.java:173) 
     at org.gradle.api.internal.tasks.compile.ApiGroovyCompiler.execute(ApiGroovyCompiler.java:59) 
     at org.gradle.api.internal.tasks.compile.daemon.CompilerDaemonServer.execute(CompilerDaemonServer.java:31) 
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
     at java.lang.reflect.Method.invoke(Method.java:498) 
     at org.gradle.process.internal.worker.request.WorkerAction.run(WorkerAction.java:87) 
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
     at java.lang.reflect.Method.invoke(Method.java:498) 
     at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35) 
     at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24) 
     at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:377) 
     at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:54) 
     at org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:40) 
     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
     at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.NoClassDefFoundError: com/sun/mail/util/ReadableMime 
     at java.lang.ClassLoader.defineClass1(Native Method) 
     at java.lang.ClassLoader.defineClass(ClassLoader.java:763) 
     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) 
     at java.net.URLClassLoader.defineClass(URLClassLoader.java:467) 
     at java.net.URLClassLoader.access$100(URLClassLoader.java:73) 
     at java.net.URLClassLoader$1.run(URLClassLoader.java:368) 
     at java.net.URLClassLoader$1.run(URLClassLoader.java:362) 
     at java.security.AccessController.doPrivileged(Native Method) 
     at java.net.URLClassLoader.findClass(URLClassLoader.java:361) 
     at java.lang.ClassLoader.loadClass(ClassLoader.java:424) 
     at java.lang.ClassLoader.loadClass(ClassLoader.java:411) 
     at groovy.lang.GroovyClassLoader.loadClass(GroovyClassLoader.java:677) 
     at groovy.lang.GroovyClassLoader.loadClass(GroovyClassLoader.java:545) 
     at org.codehaus.groovy.control.ClassNodeResolver.tryAsLoaderClassOrScript(ClassNodeResolver.java:185) 
     at org.codehaus.groovy.control.ClassNodeResolver.findClassNode(ClassNodeResolver.java:170) 
     at org.codehaus.groovy.control.ClassNodeResolver.resolveName(ClassNodeResolver.java:126) 
     at org.codehaus.groovy.control.ResolveVisitor.resolveToOuter(ResolveVisitor.java:676) 
     at org.codehaus.groovy.control.ResolveVisitor.resolve(ResolveVisitor.java:308) 
     at org.codehaus.groovy.control.ResolveVisitor.visitClass(ResolveVisitor.java:1218) 
     at org.codehaus.groovy.control.ResolveVisitor.startResolving(ResolveVisitor.java:176) 
     at org.codehaus.groovy.tools.javac.JavaAwareCompilationUnit$1.call(JavaAwareCompilationUnit.java:71) 
     at org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:1053) 
    ... 24 more Caused by: java.lang.ClassNotFoundException: com.sun.mail.util.ReadableMime 
     at java.net.URLClassLoader.findClass(URLClassLoader.java:381) 
     at java.lang.ClassLoader.loadClass(ClassLoader.java:424) 
     at java.lang.ClassLoader.loadClass(ClassLoader.java:357) 
    ... 46 more

我该如何克服这个问题？ imap库不会显示任何其他编译依赖关系，所以我不知道该怎么做。

来源

2017-05-31 Fred Fluharty

IMAPFolder和IMAPProtocol是JavaMail API的一部分。

您应该添加的

compile group: 'javax.mail', name: 'mail', version: '1.4.7'

代替

compile group: 'com.sun.mail', name: 'imap', version: '1.5.6'

也许你需要另一个版本see here

来源

2017-05-31 12:50:17

感谢您的建议。我在那里有一个依赖于javax.mail的版本，但是版本更高。

我其实刚刚在今天早上解决了这个问题。事实证明，我需要javax.mail版本1.4.3（或其附件，但至少1.4.3工作）和Sun imap 1.4.3 jar。 Gradle一直未能从任何地方拉出imap-1.4.3.jar，所以我在本地下载了它，终于开心了。

因此，建议使用javax.mail和不同版本的建议都是点亮的。

compile files('lib/imap-1.4.3.jar') 
compile group: 'javax.mail', name: 'mail', version: '1.4.3'

来源

2017-06-01 13:37:11

如何解决Grails编译中的NoClassDefFoundError？

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