eclipse - Maven Eclipse-不支持的major.minor版本52.0

Question

我正在使用apache maven 3.2.3来编译我的java项目。

当我使用命令行启动编译时使用

mvn clean compile

那么它完美地工作了。

但是，当我从Eclipse(LUNA)运行maven build时，它总是失败，并显示以下错误:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:compile (default-compile) on project MSDPEx: Execution default-compile of goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:compile failed: An API incompatibility was encountered while executing org.apache.maven.plugins:maven-compiler-plugin:2.5.1:compile: java.lang.UnsupportedClassVersionError: com/sun/tools/javac/Main : Unsupported major.minor version 52.0
[ERROR] -----------------------------------------------------
[ERROR] realm =    plugin>org.apache.maven.plugins:maven-compiler-plugin:2.5.1
[ERROR] strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
[ERROR] urls[0] = file:/home/rvnath/.m2/repository/org/apache/maven/plugins/maven-compiler-plugin/2.5.1/maven-compiler-plugin-2.5.1.jar
[ERROR] urls[1] = file:/home/rvnath/.m2/repository/org/codehaus/plexus/plexus-utils/3.0/plexus-utils-3.0.jar
[ERROR] urls[2] = file:/home/rvnath/.m2/repository/org/codehaus/plexus/plexus-compiler-api/1.9.1/plexus-compiler-api-1.9.1.jar
[ERROR] urls[3] = file:/home/rvnath/.m2/repository/org/codehaus/plexus/plexus-compiler-manager/1.9.1/plexus-compiler-manager-1.9.1.jar
[ERROR] urls[4] = file:/home/rvnath/.m2/repository/org/codehaus/plexus/plexus-compiler-javac/1.9.1/plexus-compiler-javac-1.9.1.jar
[ERROR] urls[5] = file:/home/rvnath/.m2/repository/junit/junit/3.8.1/junit-3.8.1.jar
[ERROR] Number of foreign imports: 1
[ERROR] import: Entry[import  from realm ClassRealm[maven.api, parent: null]]
[ERROR] 
[ERROR] -----------------------------------------------------
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.

使用Eclipse和Maven进行配置时是否存在问题？如果是这样，我该如何解决？

如果有帮助，我的环境如下:

OS:  Ubuntu 14.10
JDK: java version "1.7.0_75"
     OpenJDK Runtime Environment (IcedTea 2.5.4) (7u75-2.5.4-1~utopic1)
     OpenJDK 64-Bit Server VM (build 24.75-b04, mixed mode)

Eclipse installed JRE's:  java-7-openjdk-amd64 (default)

Answer 1

第一的。如果您正在使用Maven，则真相在pom文件中，而不在Eclipse中。因此，您必须在Maven中而不是在Eclipse中解决该问题。

首先，您必须将maven-compiler-plugin更新到版本3.2或3.3。并像这样配置它:

<project>
  [...]
  <build>
    [...]
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.3</version>
        <configuration>
          <source>1.7</source>
          <target>1.7</target>
        </configuration>
      </plugin>
    </plugins>
    [...]
  </build>
  [...]
</project>

您应该从命令行而不是在Eclipse中检查构建。此外，您应该知道使用 source， target选项和JDK之间的区别。