Error:unsupported class file version 52.0问题的解决

这个问题主要的原因是依赖包的编译版本比主程序的编译版本高，导致主程序无法正常编译或运行，解决这个问题无非两招：

1、提升主程序的编译器版本，用最新的编译器编译主程序，这样就可以兼容那个依赖包

2、降低依赖包的编译版本。比如maven，降低到1.6的方法是：

1. <plugin>
2. <groupId>org.apache.maven.plugins</groupId>
3. <artifactId>maven-compiler-plugin</artifactId>
4. <version>3.1</version>
5. <configuration>
6. <source>1.6</source>
7. <target>1.6</target>
8. <encoding>UTF8</encoding>
9. </configuration>
10. </plugin>

另附打本地依赖包的配置：

1. <build>
2. <sourceDirectory>src/main/java</sourceDirectory>
3. <plugins>
4. <plugin>
5. <groupId>org.apache.maven.plugins</groupId>
6. <artifactId>maven-compiler-plugin</artifactId>
7. <configuration>
8. <defaultLibBundleDir>lib</defaultLibBundleDir>
9. <source>1.5</source>
10. <target>1.5</target>
11. <encoding>UTF-8</encoding>
12. </configuration>
13. </plugin>
14. <plugin>
15. <groupId>org.apache.maven.plugins</groupId>
16. <artifactId>maven-jar-plugin</artifactId>
17. <configuration>
18. <archive>
19. <manifest>
20. <addClasspath>true</addClasspath>
21. <classpathPrefix></classpathPrefix>
22. <mainClass>com.xx.xx.xx</mainClass>
23. </manifest>
24. </archive>
25. </configuration>
26. </plugin>
27. <plugin>
28. <groupId>org.apache.maven.plugins</groupId>
29. <artifactId>maven-dependency-plugin</artifactId>
30. <executions>
31. <execution>
32. <id>copy</id>
33. <phase>install</phase>
34. <goals>
35. <goal>copy-dependencies</goal>
36. </goals>
37. <configuration>
38. <outputDirectory>
39. ${project.build.directory}
40. </outputDirectory>
41. </configuration>
42. </execution>
43. </executions>
44. </plugin>
45. <plugin>
46. <groupId>org.apache.maven.plugins</groupId>
47. <artifactId>maven-resources-plugin</artifactId>
48. <version>2.2</version>
49. <configuration>
50. <encoding>UTF-8</encoding>
51. </configuration>
52. </plugin>
53. </plugins>
54. </build>