我正在尝试使用JDK 7编译Storm Starter。
$ echo $JAVA_HOME [master]
/opt/jdk1.7.0_80
$ mvn -version
Apache Maven 3.0.5
Maven home: /usr/share/maven
Java version: 1.7.0_80, vendor: Oracle Corporation
Java home: /opt/jdk1.7.0_80/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.13.0-65-generic", arch: "amd64", family: "unix"
$ mvn clean install -DskipTests=true
...
[INFO] --- clojure-maven-plugin:1.7.1:compile (compile-clojure) @ storm-core ---
Compiling backtype.storm.LocalDRPC to /home/incubator-storm/storm-core/target/classes
Exception in thread "main" java.lang.UnsupportedClassVersionError: backtype/storm/ILocalDRPC : Unsupported major.minor version 51.0, compiling:(backtype/storm/LocalDRPC.clj:17:1)
Caused by: java.lang.UnsupportedClassVersionError: backtype/storm/ILocalDRPC : Unsupported major.minor version 51.0
根据this线程,我使用了错误的Java版本,应该使用Java7。但是我的Java版本是7。编译时。如何使该项目编译?
最佳答案
您需要确保$JAVA_HOME/bin
(或至少1.7 java
可执行文件)首先出现在您的PATH
中,因为这是插件使用的。
通过将JAVA_HOME指向JDK 1.7,我可以通过在java
中首先将路径设置为PATH
(JDK 1.6目录)来复制此问题。 clojure-maven-plugin
代码尝试确定此路径,并退回到在当前环境/ java
中仅使用PATH
的方式:
private String getJavaExecutable() throws MojoExecutionException {
Toolchain tc = toolchainManager.getToolchainFromBuildContext("jdk", //NOI18N
session);
if (tc != null) {
getLog().info("Toolchain in clojure-maven-plugin: " + tc);
String foundExecutable = tc.findTool("java");
if (foundExecutable != null) {
return foundExecutable;
} else {
throw new MojoExecutionException("Unable to find 'java' executable for toolchain: " + tc);
}
}
return "java";
}