当尝试运行使用 Jackrabbit 的应用程序（在 Tomcat7 上本地）时，无论出于何种原因，它都无法连接到数据库。从具有相同凭据的常规 Java 应用程序连接到 db 工作。如何调查连接有什么问题？有一个问题Cannot instantiate persistence manager org.apache.jackrabbit.core.persistence.pool.MySqlPersistenceManager 但没有解释。
数据库连接配置：
<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>
错误输出：
[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\version
Tue 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.
[localhost-startStop-1] ERROR org.apache.jackrabbit.core.RepositoryImpl - failed to start Repository: Cannot instantiate persistence manager org.apache.jackrabbit.core.persistence.pool.MySqlPersistenceManager
javax.jcr.RepositoryException: Cannot instantiate persistence manager org.apache.jackrabbit.core.persistence.pool.MySqlPersistenceManager
at org.apache.jackrabbit.core.RepositoryImpl.createPersistenceManager(RepositoryImpl.java:1379)
at org.apache.jackrabbit.core.RepositoryImpl.createVersionManager(RepositoryImpl.java:512)
at org.apache.jackrabbit.core.RepositoryImpl.<init>(RepositoryImpl.java:313)
at org.apache.jackrabbit.core.RepositoryImpl.create(RepositoryImpl.java:615)
at org.apache.jackrabbit.core.TransientRepository$3.getRepository(TransientRepository.java:250)
at org.apache.jackrabbit.core.TransientRepository.startRepository(TransientRepository.java:280)
at org.apache.jackrabbit.core.TransientRepository.login(TransientRepository.java:376)
at org.apache.jackrabbit.commons.AbstractRepository.login(AbstractRepository.java:144)
at org.omilab.services.repo.service.JackRabbitRepositoryProvider.<init>(JackRabbitRepositoryProvider.java:60)
at org.omilab.services.repo.service.JackRabbitRepositoryProvider.getInstance(JackRabbitRepositoryProvider.java:41)
at org.omilab.services.repo.service.JackRabbitConnector.<init>(JackRabbitConnector.java:45)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at codes.thischwa.c5c.ConnectorServlet.init(ConnectorServlet.java:79)
at javax.servlet.GenericServlet.init(GenericServlet.java:158)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1282)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1195)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1085)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5318)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5610)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:899)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:875)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1092)
at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1984)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Could not create connection to database server.)
at org.apache.commons.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1549)
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1388)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)
at org.apache.jackrabbit.core.util.db.ConnectionHelper.getExtraNameCharacters(ConnectionHelper.java:187)
at org.apache.jackrabbit.core.util.db.ConnectionHelper.prepareDbIdentifier(ConnectionHelper.java:142)
at org.apache.jackrabbit.core.persistence.pool.BundleDbPersistenceManager.init(BundleDbPersistenceManager.java:542)
at org.apache.jackrabbit.core.persistence.pool.MySqlPersistenceManager.init(MySqlPersistenceManager.java:51)
at org.apache.jackrabbit.core.RepositoryImpl.createPersistenceManager(RepositoryImpl.java:1375)
... 33 more
编辑1：
在用同一个 maven 构建的同一个 tomcat 上，这个简单的应用程序可以连接到同一个数据库：
<%@ page import="java.sql.*"%>
<html>
<head>
<title>DB</title>
</head>
<body>
<h1>DB connectivity test!</h1>
<%
String db = "repo";
String user = "admin";
String password = "password11..";
try {
java.sql.Connection con;
Class.forName("org.gjt.mm.mysql.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost/"+db, user, password);
out.println (db+ " database successfully opened.");
}
catch(SQLException e) {
out.println("SQLException caught: " +e.getMessage());
}
%>
</body>