摘要：IDEA 中启动 Tomcat 后报出 OutOfMemoryError: PermGen space 的解决方法。永久区内存溢出的解决方法。 阅读全文

摘要：MySQL8.0连接C3P0的问题，java.sql.SQLException: An attempt by a client to checkout a Connection has timed out. 阅读全文

摘要：Exception in thread "main" java.lang.Error: Unresolved compilation problem: Syntax error on token "}", delete this token 阅读全文