1.找到eclipse目录：
查看目录下是否有lifecycle-mapping-metadata.xml文件，若没有新建，内容如下：
<?xml version="1.0" encoding="UTF-8"?> <lifecycleMappingMetadata> <pluginExecutions> <pluginExecution> <pluginExecutionFilter> <groupId>org.codehaus.mojo</groupId> <artifactId>buildnumber-maven-plugin</artifactId> <goals> <goal>create-timestamp</goal> </goals> <versionRange>[0.0,)</versionRange> </pluginExecutionFilter> <action> <ignore /> </action> </pluginExecution>
<pluginExecution> <pluginExecutionFilter> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <goals> <goal>list</goal> </goals> <versionRange>[0.0,)</versionRange> </pluginExecutionFilter> <action> <ignore /> </action> </pluginExecution>
<pluginExecution> <pluginExecutionFilter> <groupId>org.zeroturnaround</groupId> <artifactId>jrebel-maven-plugin</artifactId> <goals> <goal>generate</goal> </goals> <versionRange>[0.0,)</versionRange> </pluginExecutionFilter> <action> <ignore /> </action> </pluginExecution>
<pluginExecution> <pluginExecutionFilter> <groupId>org.codehaus.mojo</groupId> <artifactId>gwt-maven-plugin</artifactId> <goals> <goal>compile</goal> </goals> <versionRange>[0.0,)</versionRange> </pluginExecutionFilter> <action> <ignore /> </action> </pluginExecution>
<pluginExecution> <pluginExecutionFilter> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <goals> <goal>copy-dependencies</goal> <goal>unpack</goal> </goals> <versionRange>[0.0,)</versionRange> </pluginExecutionFilter> <action> <ignore /> </action> </pluginExecution>
</pluginExecutions> </lifecycleMappingMetadata>
2.再次打开window>Preferences>maven> Lifecycle Mappings
点击Reload 红框中按钮，再点击apply即可
3.maven update 之后，报错就解决了
