在本文中，您将会了解到关于Antbuildfailed:Unsupportedmajor.minorversion51.0的新资讯，并给出一些关于3.java.lang.UnsupportedClas
在本文中，您将会了解到关于Ant build failed : Unsupported major.minor version 51.0的新资讯，并给出一些关于3. java.lang.UnsupportedClassVersionError: javax/annotation/ManagedBean : Unsupported major.minor...、Android 工程编译 Unsupported major.minor version 51.0 错误解决方法(JDK版本问题)、ANT 编译报错 Unsupported major.minor version 49.0、Cassandra : Unsupported major.minor version 52.0解决的实用技巧。
本文目录一览：- Ant build failed : Unsupported major.minor version 51.0
- 3. java.lang.UnsupportedClassVersionError: javax/annotation/ManagedBean : Unsupported major.minor...
- Android 工程编译 Unsupported major.minor version 51.0 错误解决方法(JDK版本问题)
- ANT 编译报错 Unsupported major.minor version 49.0
- Cassandra : Unsupported major.minor version 52.0解决
Ant build failed : Unsupported major.minor version 51.0
BUILD FAILED
E:\workspace\test\build.xml:70: The following error occurred while executing this line:
E:\workspace\test\build.xml:48: java.lang.UnsupportedClassVersionError: com/sun/tools/javac/Main : Unsupported major.minor version 51.0
eclipse ant build 的时候，出现上述错误
means that you have compiled your code against JDK 7 but you''re trying to run using JRE 6. Inside your Eclipse you are using the JDK 7, but in your Path you probably have an older Java version.
解决办法：
In Eclipse, Run -> External Tools -> External Tools Configurations -> Ant.build check the Jre version here.
https://www.zybuluo.com/livem/note/466508
http://stackoverflow.com/questions/20742802/ant-javac-target-using-different-jre-from-eclipse-java-lang-unsupportedclass
3. java.lang.UnsupportedClassVersionError: javax/annotation/ManagedBean : Unsupported major.minor...
问题描述：
解决方案：
Android 工程编译 Unsupported major.minor version 51.0 错误解决方法(JDK版本问题)
在编译高低版本Android工程时使用如下命令切换Java版本似乎并不彻底
$ sudo update-alternatives –config java
$ sudo update-alternatives –config javac
会出现如下错误：
java.lang.UnsupportedClassVersionError: com/google/doclava/Doclava : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.NET.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.Net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at com.sun.tools.javadoc.DocletInvoker.<init>(DocletInvoker.java:74)
at com.sun.tools.javadoc.Start.setDocletInvoker(Start.java:380)
at com.sun.tools.javadoc.Start.parseAndExecute(Start.java:179)
at com.sun.tools.javadoc.Start.begin(Start.java:128)
at com.sun.tools.javadoc.Main.execute(Main.java:41)
at com.sun.tools.javadoc.Main.main(Main.java:31)
Copying: out/target/common/obj/APPS/Telecom_intermediates/classes-jarjar.jar
Copying: out/target/common/obj/APPS/TelephonyProvider_intermediates/classes-jarjar.jar
javadoc: error - fatal error
Exception in thread"main"java.lang.UnsupportedClassVersionError: com/android/cts/tradefed/command/CtsConsole : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: com.android.cts.tradefed.command.CtsConsole. Program will exit.
解决方法：
$ update-java-alternatives –list
java-1.7.0-openjdk-amd64 1071 /usr/lib/jvm/java-1.7.0-openjdk-amd64
java-6-Oracle 1073 /usr/lib/jvm/java-6-oracle
$ sudo update-java-alternatives –set java-1.7.0-openjdk-amd64
ANT 编译报错 Unsupported major.minor version 49.0
项目中使用ANT进行打包的时候报出如下错误：
[native2ascii] Converting 4 files from D:\versionForSVN\***\src\config\web to D:\versionForSVN\***\dist\weblogic\epcisgqs\epcisgqs.war\WEB-INF\classes
BUILD FAILED
java.lang.UnsupportedClassVersionError: sun/tools/native2ascii/Main (Unsupported major.minor version 49.0)根据网上罗列的解决方案，大致明白是JDK版本方面的问题导致的。但是，我在Eclipse中把能想到的与JDK相关的设置都改正了，却一直没有效果，苦苦纠结了2个小时。
最后，我尝试换了一个工作空间将工程导入，结果。。。。。OK了
这应该是我第一次导入工程的时候，使用了错误的JDK，然后Eclipse进行了编译并缓存了，结果就变成这样了。
Cassandra : Unsupported major.minor version 52.0解决
今天安装了apache-cassandra-3.4-bin.tar.gz，下载：http://cassandra.apache.org/download/
版本：apache-cassandra-3.4-bin.tar.gz
OS :Win10
java 和Python 版本如下
java -version
java version "1.8.0_77"
Java(TM) SE Runtime Environment (build 1.8.0_77-b03)
Java HotSpot(TM) 64-Bit Server VM (build 25.77-b03, mixed mode
python --version : Python 2.7.11
下载后解压，启动cassandra.bat报出org/apache/cassandra/service/CassandraDaemon : Unsupported major.minor version 52.0错误。Google了一下，http://stackoverflow.com/ 说是jdk 太低的原因，将jdk从1.7 升级到1.8，仍旧报出以上错误。
之后折腾了许久，终于发现是设置的问题，要在E:\apache-cassandra-3.4\bin\cassandra.bat进行设置，
在cassandra.bat和cassandra.in.bat中添加以下语句：
set JAVA_HOME=D:\Program Files\Java\jdk1.8.0_77
set CASSANDRA_HOME=E:\apache-cassandra-3.4
再次启动cassandra.bat，正常启动.
其他
CQL 文档：http://docs.datastax.com/en/cql/3.3/pdf/cql33.pdf
http://docs.datastax.com/en/landing_page/doc/landing_page/current.html
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