The environment variable is configured as JDK8 and the Java version shown is JDK7

The discovery is the JDK version of the problem, my system environment variable configuration is JDK7, but this war package needs to run in JDK8 environment. So I manually changed the JDK7 of the environment variable to JDK8, and the result found that the above problems still occur. So I opened cmd with java-version instructions to see, I am currently configured environment variables or JDK7, which I am puzzled, clearly configured is JDK8 why or show Jdk7. After a flurry of internet searches, it turns out that Oracle also comes with a JDK, and if you configure environment variables with the JDK behind Oracle, the system will default to Oracle's JDK, causing your configuration to not work at all. In this case, it is only possible to move the JDK configuration to the front of Oracle, which will not affect the operation of Oracle.

The environment variable is configured as JDK8 and the Java version shown is JDK7