我在使用Datanucleus增强器时遇到了问题,这是用于Google App Engine项目的。如果我使用Datanucleus Eclipse插件,则一切都很好,但在我的Maven项目中,我会遇到奇怪的版本冲突错误。
我的POM文件中有以下Datanucleus引用:
<dependency>
<groupId>org.datanucleus</groupId>
<artifactId>datanucleus-core</artifactId>
<version>1.1.0</version>
</dependency>
...
<plugin>
<groupId>org.datanucleus</groupId>
<artifactId>maven-datanucleus-plugin</artifactId>
<version>1.1.0</version>
<configuration>
<mappingIncludes>**/*.class</mappingIncludes>
<verbose>true</verbose>
<enhancerName>ASM</enhancerName>
<api>JDO</api>
</configuration>
<executions>
<execution>
<phase>compile</phase>
<goals>
<goal>enhance</goal>
</goals>
</execution>
</executions>
</plugin>
编译项目时出现以下错误:
Exception in thread "main" Plugin (Bundle) "org.datanucleus" is already registered. Ensure you dont have multiple JAR versions of the same plugin in the classpath. The URL "file:/Users/drome/.m2/repository/org/datanucleus/datanucleus-core/1.1.0/**datanucleus-core-1.1.0.jar**" is already registered, and you are trying to register an identical plugin located at URL "file:/Users/drome/.m2/repository/org/datanucleus/datanucleus-core/1.1.3/**datanucleus-core-1.1.3.jar**." org.datanucleus.exceptions.NucleusException: Plugin (Bundle) "org.datanucleus" is already registered. Ensure you dont have multiple JAR versions of the same plugin in the classpath. The URL "file:/Users/drome/.m2/repository/org/datanucleus/datanucleus-core/1.1.0/datanucleus-core-1.1.0.jar" is already registered, and you are trying to register an identical plugin located at URL "file:/Users/drome/.m2/repository/org/datanucleus/datanucleus-core/1.1.3/datanucleus-core-1.1.3.jar." at org.datanucleus.plugin.NonManagedPluginRegistry.registerBundle(NonManagedPluginRegistry.java:437) at org.datanucleus.plugin.NonManagedPluginRegistry.registerBundle(NonManagedPluginRegistry.java:343) at org.datanucleus.plugin.NonManagedPluginRegistry.registerExtensions(NonManagedPluginRegistry.java:227 ) at org.datanucleus.plugin.NonManagedPluginRegistry.registerExtensionPoints(NonManagedPluginRegistry.jav a:159) at org.datanucleus.plugin.PluginManager.registerExtensionPoints(PluginManager.java:82) at org.datanucleus.OMFContext.(OMFContext.java:164) at org.datanucleus.enhancer.DataNucleusEnhancer.(DataNucleusEnhancer.java:171) at org.datanucleus.enhancer.DataNucleusEnhancer.(DataNucleusEnhancer.java:149) at org.datanucleus.enhancer.DataNucleusEnhancer.main(DataNucleusEnhancer.java:1157)
我不理解为什么datanucleus需要Maven下载datanucleus-core-1.1.3.jar,因为它没有在pom.xml中引用。
我也不明白为什么要注册datanucleus-core-1.1.3.jar...
有什么想法吗? 提前感谢...
group-a
artifact-a
1.0
group-c
excluded-artifact
- ivomvn clean compile
,我会得到错误信息Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project XXX: Fatal error compiling: java.lang.NoClassDefFoundError: org/datanucleus/util/AnnotationProcessorUtils: org.datanucleus.util.AnnotationProcessorUtils
。有什么想法吗?我正在使用datanucleus-maven-plugin:3.3.0-release
。 - Adrian Ber