當嘗試運行使用 Jackrabbit（本地在 Tomcat7 上）的應用程序時，無論出于何種原因，它都無法連接到數據庫。與 db 的連接從具有相同憑據的常規 Java 應用程序工作。如何調查連接性問題？有一個問題無法實例化持久性管理器 org.apache.jackrabbit.core.persistence.pool.MySqlPersistenceManager 但沒有解釋。數據庫連接配置：<PersistenceManager class="org.apache.jackrabbit.core.persistence.pool.MySqlPersistenceManager">      <param name="driver" value="com.mysql.jdbc.Driver"/>      <param name="url" value="jdbc:mysql://localhost:3306/repo"/>      <param name="databaseType" value="mysql"/>      <param name="user" value="admin" />      <param name="password" value="password11.." />      <param name="schemaObjectPrefix" value="${wsp.name}_"/>      <param name="externalBLOBs" value="true"/></PersistenceManager>錯誤輸出：[localhost-startStop-1] INFO org.apache.jackrabbit.core.RepositoryImpl - Starting repository...[localhost-startStop-1] INFO org.apache.jackrabbit.core.fs.local.LocalFileSystem - LocalFileSystem initialized at path jackrabbit\repository[localhost-startStop-1] INFO org.apache.jackrabbit.core.fs.local.LocalFileSystem - LocalFileSystem initialized at path jackrabbit\versionTue Aug 21 10:46:47 CEST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.