GWTP - 尝试调用方法“org.datanucleus.enhancer.asm.ASMClassEnhancer”时，ClassEnhancer“ASM”发生错误

【问题标题】：GWTP - An error occured for ClassEnhancer "ASM" when trying to call the method "org.datanucleus.enhancer.asm.ASMClassEnhancer"GWTP - 尝试调用方法“org.datanucleus.enhancer.asm.ASMClassEnhancer”时，ClassEnhancer“ASM”发生错误
【发布时间】：2015-05-17 19:28:40
【问题描述】：

我正在尝试在 Eclipse 中设置 GWTP 并创建一个最简单的 POC。 我已经安装了带有 GWT 2.6、Appengine 1.9.18 和 GWTP 插件 0.6.1 的 Google 插件。

我正在使用 Windows 7 和 Eclipse luna 4.4

我的机器上安装了两个不同版本的java版本！！！

在终端上：

D:\project>回显 %JAVA_HOME%
"D:\installations\java8"

D:\project>java -version

java 版本“1.8.0_40” Java(TM) SE 运行时环境 (build 1.8.0_40-b25) Java HotSpot(TM) 64 位服务器 VM（构建 25.40-b25，混合模式）

在 Eclipse 上：

在窗口下 --> 首选项 --> Java --> InstalledJREs 我已经选择了合适的 Java 8 安装。

================================================ =================

我正在尝试像这样创建 GWTP 项目：

单击完成后，我收到以下错误：

堆栈跟踪：

Mar 15, 2015 10:49:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions
WARNING: Extension Point "org.eclipse.core.resources.natures" not registered, but plugin "" defined in file:/D:/project/eclipse-jee-luna-R-win32-x86_64/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.6.0/gwt-2.6.0/gwt-dev.jar refers to it.
Mar 15, 2015 10:49:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions
WARNING: Extension Point "org.eclipse.core.resources.builders" not registered, but plugin "" defined in file:/D:/project/eclipse-jee-luna-R-win32-x86_64/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.6.0/gwt-2.6.0/gwt-dev.jar refers to it.
Mar 15, 2015 10:49:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions
WARNING: Extension Point "org.eclipse.core.resources.markers" not registered, but plugin "" defined in file:/D:/project/eclipse-jee-luna-R-win32-x86_64/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.6.0/gwt-2.6.0/gwt-dev.jar refers to it.
Mar 15, 2015 10:49:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions
WARNING: Extension Point "org.eclipse.core.resources.markers" not registered, but plugin "" defined in file:/D:/project/eclipse-jee-luna-R-win32-x86_64/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.6.0/gwt-2.6.0/gwt-dev.jar refers to it.
Mar 15, 2015 10:49:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions
WARNING: Extension Point "org.eclipse.core.resources.markers" not registered, but plugin "" defined in file:/D:/project/eclipse-jee-luna-R-win32-x86_64/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.6.0/gwt-2.6.0/gwt-dev.jar refers to it.
Mar 15, 2015 10:49:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions
WARNING: Extension Point "org.eclipse.core.resources.markers" not registered, but plugin "" defined in file:/D:/project/eclipse-jee-luna-R-win32-x86_64/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.6.0/gwt-2.6.0/gwt-dev.jar refers to it.
Mar 15, 2015 10:49:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions
WARNING: Extension Point "org.eclipse.ant.core.extraClasspathEntries" not registered, but plugin "" defined in file:/D:/project/eclipse-jee-luna-R-win32-x86_64/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.6.0/gwt-2.6.0/gwt-dev.jar refers to it.
Mar 15, 2015 10:49:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions
WARNING: Extension Point "org.eclipse.ant.core.antTasks" not registered, but plugin "" defined in file:/D:/project/eclipse-jee-luna-R-win32-x86_64/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.6.0/gwt-2.6.0/gwt-dev.jar refers to it.
Mar 15, 2015 10:49:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions
WARNING: Extension Point "org.eclipse.jdt.core.classpathContainerInitializer" not registered, but plugin "" defined in file:/D:/project/eclipse-jee-luna-R-win32-x86_64/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.6.0/gwt-2.6.0/gwt-dev.jar refers to it.
Mar 15, 2015 10:49:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions
WARNING: Extension Point "org.eclipse.team.core.fileTypes" not registered, but plugin "" defined in file:/D:/project/eclipse-jee-luna-R-win32-x86_64/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.6.0/gwt-2.6.0/gwt-dev.jar refers to it.
Mar 15, 2015 10:49:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions
WARNING: Extension Point "org.eclipse.core.runtime.applications" not registered, but plugin "" defined in file:/D:/project/eclipse-jee-luna-R-win32-x86_64/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.6.0/gwt-2.6.0/gwt-dev.jar refers to it.
Mar 15, 2015 10:49:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions
WARNING: Extension Point "org.eclipse.core.runtime.applications" not registered, but plugin "" defined in file:/D:/project/eclipse-jee-luna-R-win32-x86_64/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.6.0/gwt-2.6.0/gwt-dev.jar refers to it.
Mar 15, 2015 10:49:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions
WARNING: Extension Point "org.eclipse.core.contenttype.contentTypes" not registered, but plugin "" defined in file:/D:/project/eclipse-jee-luna-R-win32-x86_64/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.6.0/gwt-2.6.0/gwt-dev.jar refers to it.
Mar 15, 2015 10:49:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions
WARNING: Extension Point "org.eclipse.core.runtime.preferences" not registered, but plugin "" defined in file:/D:/project/eclipse-jee-luna-R-win32-x86_64/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.6.0/gwt-2.6.0/gwt-dev.jar refers to it.
Mar 15, 2015 10:49:28 PM org.datanucleus.plugin.NonManagedPluginRegistry registerExtensions
WARNING: Extension Point "org.eclipse.core.runtime.preferences" not registered, but plugin "" defined in file:/D:/project/eclipse-jee-luna-R-win32-x86_64/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.6.0/gwt-2.6.0/gwt-dev.jar refers to it.
DataNucleus Enhancer (version 1.1.4) : Enhancement of classes
Mar 15, 2015 10:49:28 PM org.datanucleus.enhancer.DataNucleusEnhancer addMessage
SEVERE: An error occured for ClassEnhancer "ASM" when trying to call the method "org.datanucleus.enhancer.asm.ASMClassEnhancer" on class "getClassNameForFileName" : null
java.lang.IllegalArgumentException
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.datanucleus.enhancer.asm.ASMClassEnhancer.getClassNameForFileName(ASMClassEnhancer.java:155)
    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:497)
    at org.datanucleus.enhancer.DataNucleusEnhancer.getClassNameForFilename(DataNucleusEnhancer.java:920)
    at org.datanucleus.enhancer.DataNucleusEnhancer.getFileMetadataForInput(DataNucleusEnhancer.java:736)
    at org.datanucleus.enhancer.DataNucleusEnhancer.enhance(DataNucleusEnhancer.java:545)
    at org.datanucleus.enhancer.DataNucleusEnhancer.main(DataNucleusEnhancer.java:1252)
    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:497)
    at com.google.appengine.tools.enhancer.Enhancer.execute(Enhancer.java:74)
    at com.google.appengine.tools.enhancer.Enhance.<init>(Enhance.java:71)
    at com.google.appengine.tools.enhancer.Enhance.main(Enhance.java:51)
.
An error occured for ClassEnhancer "ASM" when trying to call the method "org.datanucleus.enhancer.asm.ASMClassEnhancer" on class "getClassNameForFileName" : null
java.lang.IllegalArgumentException
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.datanucleus.enhancer.asm.ASMClassEnhancer.getClassNameForFileName(ASMClassEnhancer.java:155)
    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:497)
    at org.datanucleus.enhancer.DataNucleusEnhancer.getClassNameForFilename(DataNucleusEnhancer.java:920)
    at org.datanucleus.enhancer.DataNucleusEnhancer.getFileMetadataForInput(DataNucleusEnhancer.java:736)
    at org.datanucleus.enhancer.DataNucleusEnhancer.enhance(DataNucleusEnhancer.java:545)
    at org.datanucleus.enhancer.DataNucleusEnhancer.main(DataNucleusEnhancer.java:1252)
    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:497)
    at com.google.appengine.tools.enhancer.Enhancer.execute(Enhancer.java:74)
    at com.google.appengine.tools.enhancer.Enhance.<init>(Enhance.java:71)
    at com.google.appengine.tools.enhancer.Enhance.main(Enhance.java:51)
.
Mar 15, 2015 10:49:28 PM org.datanucleus.enhancer.DataNucleusEnhancer addMessage
SEVERE: An error occured for ClassEnhancer "ASM" when trying to call the method "org.datanucleus.enhancer.asm.ASMClassEnhancer" on class "getClassNameForFileName" : null
java.lang.IllegalArgumentException
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.datanucleus.enhancer.asm.ASMClassEnhancer.getClassNameForFileName(ASMClassEnhancer.java:155)
    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:497)
    at org.datanucleus.enhancer.DataNucleusEnhancer.getClassNameForFilename(DataNucleusEnhancer.java:920)
    at org.datanucleus.enhancer.DataNucleusEnhancer.getFileMetadataForInput(DataNucleusEnhancer.java:736)
    at org.datanucleus.enhancer.DataNucleusEnhancer.enhance(DataNucleusEnhancer.java:545)
    at org.datanucleus.enhancer.DataNucleusEnhancer.main(DataNucleusEnhancer.java:1252)
    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:497)
    at com.google.appengine.tools.enhancer.Enhancer.execute(Enhancer.java:74)
    at com.google.appengine.tools.enhancer.Enhance.<init>(Enhance.java:71)
    at com.google.appengine.tools.enhancer.Enhance.main(Enhance.java:51)
.
An error occured for ClassEnhancer "ASM" when trying to call the method "org.datanucleus.enhancer.asm.ASMClassEnhancer" on class "getClassNameForFileName" : null
java.lang.IllegalArgumentException
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.datanucleus.enhancer.asm.ASMClassEnhancer.getClassNameForFileName(ASMClassEnhancer.java:155)
    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:497)
    at org.datanucleus.enhancer.DataNucleusEnhancer.getClassNameForFilename(DataNucleusEnhancer.java:920)
    at org.datanucleus.enhancer.DataNucleusEnhancer.getFileMetadataForInput(DataNucleusEnhancer.java:736)
    at org.datanucleus.enhancer.DataNucleusEnhancer.enhance(DataNucleusEnhancer.java:545)
    at org.datanucleus.enhancer.DataNucleusEnhancer.main(DataNucleusEnhancer.java:1252)
    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:497)
    at com.google.appengine.tools.enhancer.Enhancer.execute(Enhancer.java:74)
    at com.google.appengine.tools.enhancer.Enhance.<init>(Enhance.java:71)
    at com.google.appengine.tools.enhancer.Enhance.main(Enhance.java:51)
.
.
An error occured for ClassEnhancer "ASM" when trying to call the method "org.datanucleus.enhancer.asm.ASMClassEnhancer" on class "getClassNameForFileName" : null
java.lang.IllegalArgumentException
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.objectweb.asm.ClassReader.<init>(Unknown Source)
    at org.datanucleus.enhancer.asm.ASMClassEnhancer.getClassNameForFileName(ASMClassEnhancer.java:155)
    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:497)
    at org.datanucleus.enhancer.DataNucleusEnhancer.getClassNameForFilename(DataNucleusEnhancer.java:920)
    at org.datanucleus.enhancer.DataNucleusEnhancer.getFileMetadataForInput(DataNucleusEnhancer.java:736)
    at org.datanucleus.enhancer.DataNucleusEnhancer.enhance(DataNucleusEnhancer.java:545)
    at org.datanucleus.enhancer.DataNucleusEnhancer.main(DataNucleusEnhancer.java:1252)
    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:497)
    at com.google.appengine.tools.enhancer.Enhancer.execute(Enhancer.java:74)
    at com.google.appengine.tools.enhancer.Enhance.<init>(Enhance.java:71)
    at com.google.appengine.tools.enhancer.Enhance.main(Enhance.java:51)
.
DataNucleus Enhancer completed with success for 0 classes. Timings : input=32 ms, enhance=0 ms, total=32 ms. Consult the log for full details
DataNucleus Enhancer completed and no classes were enhanced. Consult the log for full details

###EDIT###

重新安装后，一切正常。可以在这个 google 组 thred 上跟踪 GWTP 初学者需要知道的所有内容的超级详细解释。 https://groups.google.com/forum/#!topic/gwt-platform/5iE5B_RTCuQ

【问题讨论】：

    标签： google-app-engine gwt gwtp gwt-platform


    【解决方案1】：

    GWTP 0.6.1 已经很老了。对于 eclipse Luna，您需要安装最新版本的插件。从http://arcbees.github.io/gwtp-eclipse-plugin/安装它

    【讨论】：

    • 感谢新插件，但更新后仍然存在同样的错误。
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