Unsupported major.minor version 52.0

最新推荐文章于 2025-10-09 16:23:15 发布
原创 最新推荐文章于 2025-10-09 16:23:15 发布 · 1.3k 阅读 · 1 ·
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本文介绍在制作AndroidN版本OTA升级包时遇到的UnsupportedClassVersionError异常及其解决方法，原因是使用的JDK版本过低，需从JDK1.7升级到JDK1.8。

Android N版本制作OTA升级包时出现如下异常：

Exception in thread "main" java.lang.UnsupportedClassVersionError: com/android/signapk/SignApk : Unsupported major.minor version 52.0

原因是使用的是JDK1.7版本，需要切换为JDK1.8版本


使用~/java -version  确认JDK版本为1.8后重新执行差分包制作脚本即可。


详细log如下：


boot      target: 8772904  source: 8770856  diff: 6294805
boot image changed; including patch.
/home/user1/myproject_code/build/tools/releasetools/common.py:1257: UserWarning: Duplicate name: 'type.txt'
  zip_file.writestr(zinfo, data)
/home/user1/myproject_code/build/tools/releasetools/common.py:1257: UserWarning: Duplicate name: 'scatter.txt'
  zip_file.writestr(zinfo, data)
Exception in thread "main" java.lang.UnsupportedClassVersionError: com/android/signapk/SignApk : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:803)
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$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)


   ERROR: signapk.jar failed: return code 1


md5sum: update.zip: No such file or directory
zip warning: name not matched: update.zip
  adding: md5sum (stored 0%)
rm: cannot remove ‘update.zip’: No such file or directory
4.0K package.zip

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