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问题出现场景使用jdk1.8的时候设置了vm参数：-Xmx2048m -XX:PermSize=512m -XX:MaxPermSize=768m -Xss2m此时运行java程序时VM提示如下警告：Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=512m; support was removed in 8.0Java HotSpot(TM) 64-Bit Server VM warning: ignoring

JDK 8 + tomcat8 启动有时会出现 org.apache.catalina.util.SessionIdGeneratorBase- Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [413,255] milliseconds耗时时间很长。Tomcat 8启动很慢，且...