Java 不支持的major.minor 版本52.0（无法加载类）
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Unsupported major.minor version 52.0 (unable to load class)
提问by user7637864
When i run my project i am getting the following exception:
当我运行我的项目时，我收到以下异常：
javax.servlet.ServletException: java.lang.UnsupportedClassVersionError: apache/commons/codec/UtilityUtil : Unsupported major.minor version 52.0 (unable to load class apache.commons.codec.UtilityUtil)
I have researched and found out that it happens if the version of java is different from runtime and compilation time.
我研究并发现如果java的版本与运行时和编译时间不同，就会发生这种情况。
I have followed these two posts and tried to figure out that i am using java 8 and runtime has 1.7.: Unsupported major.minor version 52.0 captive portalHow to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version
我已经关注了这两篇文章，并试图弄清楚我使用的是 java 8 并且运行时有 1.7。： 不支持的major.minor 版本 52.0 强制门户如何修复 java.lang.UnsupportedClassVersionError：不支持的major.minor 版本
I have changed the compilation version to 1.7. But still the same problem exists. I dont know why.
我已将编译版本更改为 1.7。但仍然存在同样的问题。我不知道为什么。
Runtime version: 1.7.0_45 Compilation Version: 1.7.0_80.
运行时版本：1.7.0_45 编译版本：1.7.0_80。
采纳答案by efekctive
This is a duplicate. The classes you are using are probably compiled with Java 1.8 and your jvm is 1.7. That also includes 3rd party jars
这是一个重复。您使用的类可能是用 Java 1.8 编译的，而您的 jvm 是 1.7。这也包括第 3 方罐子
回答by Luca D'Amico
52 = J2SE 8. You are still compiling with Java 1.8 (or some libs you are using are compiled with 1.8 as pointed out by @efekctive).
52 = J2SE 8. 您仍在使用 Java 1.8 进行编译（或者如@efekctive 所指出的那样，您正在使用的某些库是使用 1.8 编译的）。
Please post what command are you using to build.
请发布您使用什么命令来构建。
回答by user7637864
As @efekctive stated my build is using java 8 for building the class. Changed the version back to 7 and worked as expected. Thanks everyone.
正如@efekctive 所说，我的构建使用 java 8 来构建类。将版本改回 7 并按预期工作。谢谢大家。
回答by RKA
Please do the following steps to find out yourJRE version and JDK version.
请按照以下步骤找出您的 JRE 版本和 JDK 版本。
JRE check
JRE检查
java -version
版本
java version "1.7.0_111" OpenJDK Runtime Environment (IcedTea 2.6.7) (7u111-2.6.7-2~deb7u1) OpenJDK 64-Bit Server VM (build 24.111-b01, mixed mode)
java version "1.7.0_111" OpenJDK Runtime Environment (IcedTea 2.6.7) (7u111-2.6.7-2~deb7u1) OpenJDK 64-Bit Server VM (build 24.111-b01,混合模式)
JDK check
JDK检查
javac -version
javac -version
javac 1.6.0_38
javac 1.6.0_38
And you can find that both the versions are different. So, make them into common version. That will solve your issue.
你会发现这两个版本是不同的。所以，把它们做成通用版本。那将解决您的问题。
