在使用gradle项目时，build一个文件过程中出现以下情况：

> Task :compileJava

/home/user_1/idea-program/avro-car-sensor-simulator-master/src/main/java/com/hivemq/CarDataPayloadGenerator.java:7: error: cannot access PluginPayloadGenerator

import com.hivemq.simulator.plugin.sdk.load.generators.PluginPayloadGenerator;

^

bad class file: /home/user_1/idea-program/avro-car-sensor-simulator-master/device-simulator-plugin-sdk-1.0.0.jar(com/hivemq/simulator/plugin/sdk/load/generators/PluginPayloadGenerator.class)

class file has wrong version 55.0, should be 52.0

Please remove or make sure it appears in the correct subdirectory of the classpath.

> Task :compileJava FAILED

FAILURE: Build failed with an exception.

* What went wrong:

Execution failed for task ':compileJava'.

> Compilation failed; see the compiler error output for details.

* Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

根据上述错误情况：

“bad class file: /home/user_1/idea-program/avro-car-sensor-simulator-master/device-simulator-plugin-sdk-1.0.0.jar(com/hivemq/simulator/plugin/sdk/load/generators/PluginPayloadGenerator.class)

class file has wrong version 55.0, should be 52.0

Please remove or make sure it appears in the correct subdirectory of the classpath.”

可以知道在idea-program/avro-car-sensor-simulator-master/device-simulator-plugin-sdk-1.0.0.jar内出现问题，该文件需要的是55版本，而当前环境为52版本。

(错误原因：使用JDK为8的JRE运行JDK为11编译的class文件)

Java对应的版本如下：

ava SE 13 = 57,

Java SE 12 = 56,

Java SE 11 = 55,

Java SE 10 = 54,

Java SE 9 = 53,

Java SE 8 = 52,

Java SE 7 = 51,

Java SE 6.0 = 50,

Java SE 5.0 = 49,

JDK 1.4 = 48,

JDK 1.3 = 47,

JDK 1.2 = 46,

JDK 1.1 = 45

参考文档：https://bbs.csdn.net/topics/310004779

配置JAVA11完后，再次试验编译成功