SpringBoot项目 控制台一直输出jdbc线程空指针

Question

如图所有一切都正常 就是控制台一直报这个 但是不影响任何接口调用

Exception in thread "Thread-34" java.lang.RuntimeException: java.lang.NullPointerException
    at com.mysql.jdbc.JDBC4Connection$1$1.run(JDBC4Connection.java:106)
Caused by: java.lang.NullPointerException
    at com.mysql.jdbc.ConnectionImpl.abortInternal(ConnectionImpl.java:1229)
    at com.mysql.jdbc.JDBC4Connection$1$1.run(JDBC4Connection.java:104)
Exception in thread "Thread-36" java.lang.RuntimeException: java.lang.NullPointerException
    at com.mysql.jdbc.JDBC4Connection$1$1.run(JDBC4Connection.java:106)
Caused by: java.lang.NullPointerException
    at com.mysql.jdbc.ConnectionImpl.abortInternal(ConnectionImpl.java:1229)
    at com.mysql.jdbc.JDBC4Connection$1$1.run(JDBC4Connection.java:104)
Exception in thread "Thread-38" java.lang.RuntimeException: java.lang.NullPointerException
    at com.mysql.jdbc.JDBC4Connection$1$1.run(JDBC4Connection.java:106)
Caused by: java.lang.NullPointerException
    at com.mysql.jdbc.ConnectionImpl.abortInternal(ConnectionImpl.java:1229)
    at com.mysql.jdbc.JDBC4Connection$1$1.run(JDBC4Connection.java:104)
Exception in thread "Thread-41" java.lang.RuntimeException: java.lang.NullPointerException
    at com.mysql.jdbc.JDBC4Connection$1$1.run(JDBC4Connection.java:106)
Caused by: java.lang.NullPointerException
    at com.mysql.jdbc.ConnectionImpl.abortInternal(ConnectionImpl.java:1229)
    at com.mysql.jdbc.JDBC4Connection$1$1.run(JDBC4Connection.java:104)

Answer 1

猜测是mysql服务端的连接数不足了，而Java服务的数据库连接池设置线程数过大。
解决办法有两种：
1、修改mysql服务端连接数，重启mysql
2、降低数据库连接池最大线程数