不支持的major.minor版本52.0 - grails

Question

我刚从svn。

下载了一个grails项目

我看到不受支持的major.minor版本是well known problem on S.O.，是由于在运行时和编译时使用的JDK版本不匹配引起的。

但我使用的版本如下：

壳：

JAVA构建路径：

已安装的JRE：

请原因我仍然错过了以下错误？

Environment set to development
  [groovyc] Compiling 190 source files to C:\Users\xxx
java.lang.UnsupportedClassVersionError: com/sun/tools/javac/Main : Unsupported major.minor version 52.0
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:116)
    at _GrailsCompile_groovy$_run_closure4_closure10.doCall(_GrailsCompile_groovy:117)
    at _GrailsCompile_groovy$_run_closure4_closure10.doCall(_GrailsCompile_groovy)
    at _GrailsSettings_groovy$_run_closure10.doCall(_GrailsSettings_groovy:280)
    at _GrailsSettings_groovy$_run_closure10.call(_GrailsSettings_groovy)
    at _GrailsCompile_groovy$_run_closure4.doCall(_GrailsCompile_groovy:104)
    at _GrailsCompile_groovy$_run_closure3.doCall(_GrailsCompile_groovy:69)
    at _GrailsPackage_groovy$_run_closure2_closure9.doCall(_GrailsPackage_groovy:85)
    at _GrailsPackage_groovy$_run_closure2_closure9.doCall(_GrailsPackage_groovy)
    at _GrailsSettings_groovy$_run_closure10.doCall(_GrailsSettings_groovy:280)
    at _GrailsSettings_groovy$_run_closure10.call(_GrailsSettings_groovy)
    at _GrailsPackage_groovy$_run_closure2.doCall(_GrailsPackage_groovy:84)
    at RunApp$_run_closure1.doCall(RunApp:28)
    at gant.Gant$_dispatch_closure5.doCall(Gant.groovy:381)
    at gant.Gant$_dispatch_closure7.doCall(Gant.groovy:415)
    at gant.Gant$_dispatch_closure7.doCall(Gant.groovy)
    at gant.Gant.withBuildListeners(Gant.groovy:427)
    at gant.Gant.this$2$withBuildListeners(Gant.groovy)
    at gant.Gant$this$2$withBuildListeners.callCurrent(Unknown Source)
    at gant.Gant.dispatch(Gant.groovy:415)
    at gant.Gant.this$2$dispatch(Gant.groovy)
    at gant.Gant.invokeMethod(Gant.groovy)
    at gant.Gant.executeTargets(Gant.groovy:590)
    at gant.Gant.executeTargets(Gant.groovy:589)
Caused by: java.lang.UnsupportedClassVersionError: com/sun/tools/javac/Main : Unsupported major.minor version 52.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:190)
    at org.codehaus.groovy.tools.javac.JavacJavaCompiler.findJavac(JavacJavaCompiler.java:160)
    at org.codehaus.groovy.tools.javac.JavacJavaCompiler.compile(JavacJavaCompiler.java:49)
    at org.codehaus.groovy.tools.javac.JavaAwareCompilationUnit.gotoPhase(JavaAwareCompilationUnit.java:94)
    at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:484)
    at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:453)
    at org.codehaus.groovy.tools.FileSystemCompiler.compile(FileSystemCompiler.java:67)
    at org.codehaus.groovy.tools.FileSystemCompiler.doCompilation(FileSystemCompiler.java:180)
    at org.codehaus.groovy.ant.Groovyc.compile(Groovyc.java:905)
    at org.codehaus.groovy.ant.Groovyc.execute(Groovyc.java:607)
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    ... 23 more
--- Nested Exception ---
java.lang.UnsupportedClassVersionError: com/sun/tools/javac/Main : Unsupported major.minor version 52.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:190)
    at org.codehaus.groovy.tools.javac.JavacJavaCompiler.findJavac(JavacJavaCompiler.java:160)
    at org.codehaus.groovy.tools.javac.JavacJavaCompiler.compile(JavacJavaCompiler.java:49)
    at org.codehaus.groovy.tools.javac.JavaAwareCompilationUnit.gotoPhase(JavaAwareCompilationUnit.java:94)
    at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:484)
    at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:453)
    at org.codehaus.groovy.tools.FileSystemCompiler.compile(FileSystemCompiler.java:67)
    at org.codehaus.groovy.tools.FileSystemCompiler.doCompilation(FileSystemCompiler.java:180)
    at org.codehaus.groovy.ant.Groovyc.compile(Groovyc.java:905)
    at org.codehaus.groovy.ant.Groovyc.execute(Groovyc.java:607)
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    at _GrailsCompile_groovy$_run_closure4_closure10.doCall(_GrailsCompile_groovy:117)
    at _GrailsCompile_groovy$_run_closure4_closure10.doCall(_GrailsCompile_groovy)
    at _GrailsSettings_groovy$_run_closure10.doCall(_GrailsSettings_groovy:280)
    at _GrailsSettings_groovy$_run_closure10.call(_GrailsSettings_groovy)
    at _GrailsCompile_groovy$_run_closure4.doCall(_GrailsCompile_groovy:104)
    at _GrailsCompile_groovy$_run_closure3.doCall(_GrailsCompile_groovy:69)
    at _GrailsPackage_groovy$_run_closure2_closure9.doCall(_GrailsPackage_groovy:85)
    at _GrailsPackage_groovy$_run_closure2_closure9.doCall(_GrailsPackage_groovy)
    at _GrailsSettings_groovy$_run_closure10.doCall(_GrailsSettings_groovy:280)
    at _GrailsSettings_groovy$_run_closure10.call(_GrailsSettings_groovy)
    at _GrailsPackage_groovy$_run_closure2.doCall(_GrailsPackage_groovy:84)
    at RunApp$_run_closure1.doCall(RunApp:28)
    at gant.Gant$_dispatch_closure5.doCall(Gant.groovy:381)
    at gant.Gant$_dispatch_closure7.doCall(Gant.groovy:415)
    at gant.Gant$_dispatch_closure7.doCall(Gant.groovy)
    at gant.Gant.withBuildListeners(Gant.groovy:427)
    at gant.Gant.this$2$withBuildListeners(Gant.groovy)
    at gant.Gant$this$2$withBuildListeners.callCurrent(Unknown Source)
    at gant.Gant.dispatch(Gant.groovy:415)
    at gant.Gant.this$2$dispatch(Gant.groovy)
    at gant.Gant.invokeMethod(Gant.groovy)
    at gant.Gant.executeTargets(Gant.groovy:590)
    at gant.Gant.executeTargets(Gant.groovy:589)
Compilation error: java.lang.UnsupportedClassVersionError: com/sun/tools/javac/Main : Unsupported major.minor version 52.0

我通过右击项目运行它 - ＆gt; run-as - ＆gt; grailsCommand（run-app）

Answer 1

该项目是使用较新版本的JDK编译的，但是在旧版本中运行。清理所有代码并重建项目。

有时候这是因为插件的二进制文件是用更高版本的Java编译的。