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我创建了一个使用 mysql 的网络应用程序。我使用弹簧来保持持久性。每件事都在我的本地 tomcat 服务器上运行。我将它上传到 cloudfoundary，我按照指示创建了一个 mysql 服务，并将它用作我的网络应用程序的服务。我尝试运行该应用程序，但出现以下异常：

HTTP Status 500 - 

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type Exception report

message 

description The server encountered an internal error () that prevented it from fulfilling this request.

exception 

org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
    org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
    org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:573)
    org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:812)
    org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:868)
    org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:876)
    com.tutorialspoint.StudentJDBCTemplate.create(StudentJDBCTemplate.java:19)
    com.tutorialspoint.Hello.doGet(Hello.java:58)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)


root cause 

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
    sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)
    com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:344)
    com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2332)
    com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2369)
    com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2153)
    com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:792)
    com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
    sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)
    com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
    java.sql.DriverManager.getConnection(DriverManager.java:582)
    java.sql.DriverManager.getConnection(DriverManager.java:154)
    org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:173)
    org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriver(DriverManagerDataSource.java:164)
    org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnectionFromDriver(AbstractDriverBasedDataSource.java:149)
    org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnection(AbstractDriverBasedDataSource.java:119)
    org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
    org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
    org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:573)
    org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:812)
    org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:868)
    org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:876)
    com.tutorialspoint.StudentJDBCTemplate.create(StudentJDBCTemplate.java:19)
    com.tutorialspoint.Hello.doGet(Hello.java:58)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)


root cause 

java.net.ConnectException: Connection refused
    java.net.PlainSocketImpl.socketConnect(Native Method)
    java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
    java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
    java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
    java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
    java.net.Socket.connect(Socket.java:529)
    java.net.Socket.connect(Socket.java:478)
    java.net.Socket.<init>(Socket.java:375)
    java.net.Socket.<init>(Socket.java:218)
    com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:257)
    com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:294)
    com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2332)
    com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2369)
    com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2153)
    com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:792)
    com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
    sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)
    com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
    java.sql.DriverManager.getConnection(DriverManager.java:582)
    java.sql.DriverManager.getConnection(DriverManager.java:154)
    org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:173)
    org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriver(DriverManagerDataSource.java:164)
    org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnectionFromDriver(AbstractDriverBasedDataSource.java:149)
    org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnection(AbstractDriverBasedDataSource.java:119)
    org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
    org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
    org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:573)
    org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:812)
    org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:868)
    org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:876)
    com.tutorialspoint.StudentJDBCTemplate.create(StudentJDBCTemplate.java:19)
    com.tutorialspoint.Hello.doGet(Hello.java:58)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)


note The full stack trace of the root cause is available in the Apache Tomcat/6.0.35 logs.


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Apache Tomcat/6.0.35
4

1 回答 1

1

如果问题仍然存在：有 2 种方法可以配置与 CF 服务的连接。

1）利用“自动重新配置”。对于任何Java应用程序，如果是使用Spring框架，这里的文档具体描述了细节：http ://docs.cloudfoundry.com/frameworks/java/spring/spring.html

2) 对于 Java 应用程序，除 Spring 应用程序外，连接到 CF 提供的服务的详细信息（如主机名或密码）需要明确注意。这些可以通过名为“VCAP_SERVICES”的环境变量检索。只需这个代码片段就可以实现：

System.getenv("VCAP_SERVICES")

之后将属性设置为连接配置。

于 2012-12-12T03:24:06.213 回答