目前我在单连接模式下使用h2数据库。 以下是我当前的配置：
javax.persistence.jdbc.url=jdbc:h2:file:sql/xacml;MODE=MySQL
我想支持h2数据库的多个连接，我按照链接中提到的步骤操作： http://www.h2database.com/html/tutorial.html#using_server
我的新配置如下：
javax.persistence.jdbc.url=jdbc:h2:tcp://localhost/var/lib/servers/console/bin/sql/xacml;MODE=MySQL
但是，当我尝试访问初始化连接的UI页面时，我遇到异常：
[EL Info]: 2015-05-20 10:57:45.533--ServerSession(428804302)--EclipseLink, version: Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd
[EL Severe]: ejb: 2015-05-20 10:57:48.497--ServerSession(428804302)--Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: org.h2.jdbc.JdbcSQLException: Connection is broken: "java.net.ConnectException: Connection refused: localhost" [90067-174]
Error Code: 90067
[EL Info]: 2015-05-20 10:57:48.502--ServerSession(428804302)--EclipseLink, version: Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd
May 20, 2015 10:57:48 AM com.vaadin.server.DefaultErrorHandler doDefault
SEVERE:
javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: org.h2.jdbc.JdbcSQLException: Connection is broken: "java.net.ConnectException: Connection refused: localhost" [90067-174]
Error Code: 90067
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:766)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:204)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:304)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:336)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:302)
at com.att.research.xacml.admin.XacmlAdminUI.init(XacmlAdminUI.java:278)
at com.vaadin.ui.UI.doInit(UI.java:646)
at com.vaadin.server.communication.UIInitHandler.getBrowserDetailsUI(UIInitHandler.java:214)
at com.vaadin.server.communication.UIInitHandler.synchronizedHandleRequest(UIInitHandler.java:74)
at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41)
at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1408)
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:350)
at com.att.research.xacml.admin.XacmlAdminUI$Servlet.service(XacmlAdminUI.java:235)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1086)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:659)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1558)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1515)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: org.h2.jdbc.JdbcSQLException: Connection is broken: "java.net.ConnectException: Connection refused: localhost" [90067-174]
Error Code: 90067
at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:331)
at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:326)
at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:138)
at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162)
at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.setOrDetectDatasource(DatabaseSessionImpl.java:204)
at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:741)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:239)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:685)
... 35 more
Caused by: org.h2.jdbc.JdbcSQLException: Connection is broken: "java.net.ConnectException: Connection refused: localhost" [90067-174]
at org.h2.message.DbException.getJdbcSQLException(DbException.java:332)
at org.h2.message.DbException.get(DbException.java:161)
at org.h2.engine.SessionRemote.connectServer(SessionRemote.java:417)
at org.h2.engine.SessionRemote.connectEmbeddedOrServer(SessionRemote.java:305)
at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:105)
at org.h2.jdbc.JdbcConnection.<init>(JdbcConnection.java:90)
at org.h2.Driver.connect(Driver.java:73)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:208)
at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:98)
... 40 more
Caused by: java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.h2.util.NetUtils.createSocket(NetUtils.java:119)
at org.h2.util.NetUtils.createSocket(NetUtils.java:100)
at org.h2.engine.SessionRemote.initTransfer(SessionRemote.java:100)
at org.h2.engine.SessionRemote.connectServer(SessionRemote.java:413)
... 47 more
有人能指出如何使这种配置有效吗？
答案 0 :(得分：1)
错误消息似乎表明H2服务器未启动。
当您使用H2服务器URL连接时，必须先由您的应用程序或其他Java进程启动服务器。
因此，您可以决定将以下魔术线放在哪里，启动H2服务器：
org.h2.tools.Server.createTcpServer('-tcpAllowOthers').start();
请确保您之前已创建H2数据库，并记住服务器URL中的路径与服务器启动的位置有关。因此，如果你举例说明启动java进程的H2数据库，你只需要以下url jdbc：h2：tcp：// localhost / mydatabase