我有一个网页应用程序，在以下环境下运行良好：
- GWT 2.4.0
- RestEasy 2.3.2.Final JAX-RS & JAXB
- Hibernate JPA 2.0 (hibernate-entitymanager + hibernate-validator) 4.2.0.Final
- MySQL 5.5.22 在本地（Ubuntu 12.04）
- VMware 2.6 Tomcat服务器
这个应用程序成功地使用了JAX-RS、JAXB、Jackson JSON提供程序、Hibernate JPA注释，它们都混合在同一个DTO中。
我正在尝试将它移植到GAE CloudSQL。我遇到了MySQL访问错误。我不得不将ORM从Hibernate更改为EclipseLink 2.3.2。
提醒：
我恳请回答者不要猜测我的代码可能存在错误，而是解决手头的问题 - 如何将基于Hibernate的JPA移植到EclipseLink。除非您认为我的Hibernate设置或代码需要更改才能与GAE CloudSQL配合使用。原因是应用程序在Hibernate下正常工作。
如果不涉及Hibernate JPA 2.0，请不要提供有关如何使Hibernate与GAE CloudSQL配合工作的说明。我知道互联网上有一个关于如何在CloudSQL上使用Hibernate的示例，但没有JPA。
如果您有关于如何使DataNucleus JPA 2.0与GAE CloudSQL配合工作的信息，将非常有帮助。我无法使其工作，这就是我使用EclipseLink的原因。
此外，MySQL数据源用户和密码可以通过Eclipse数据源资源管理器或SQL资源管理器或SQL Squirrel客户端访问数据库。因此，用户/密码没有问题。除非您认为我需要修改MqSQL用户或主机设置。
我已经在mysql.db表中添加了一行附加的内容，以包括主机localhost.localdomain。
我已经按照http://developers.google.com/cloud-sql/docs/developers_guide_java中的“在开发期间使用本地MySQL实例”指示修改了我的启动/调试配置，即-Drdbms.url = jdbc:mysql:// localhost:3306/Site?user=site&password=random&useInformationSchema=true&useUnicode=true&characterEncoding=UTF8&useServerPrepStmts=true。
您的解决方案建议必须涉及JPA 2.0而不是1.0。
我没有访问我的CloudSQL帐户，而是访问在Ubuntu 12.04上运行的本地MySQL数据库。我尚未尝试使用此应用程序访问我的CloudSQL数据库。
请帮忙给予建议。非常感谢。
错误堆栈显示java.security.AccessControlException: access denied ("java.net.SocketPermission" "localhost" "resolve"):
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance_(Runtime.java:126)
at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance(Runtime.java:134)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1013)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:927)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2411)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2153)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:792)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance_(Runtime.java:126)
at com.google.appengine.tools.development.agent.runtime.Runtime.newInstance(Runtime.java:134)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
at java.sql.DriverManager.getConnection(DriverManager.java:579)
at java.sql.DriverManager.getConnection(DriverManager.java:190)
at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:98)
... 55 more
Caused by: java.security.AccessControlException: access denied ("java.net.SocketPermission" "localhost" "resolve")
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:366)
at java.security.AccessController.checkPermission(AccessController.java:555)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkPermission(DevAppServerFactory.java:252)
at java.lang.SecurityManager.checkConnect(SecurityManager.java:1048)
at java.net.InetAddress.getAllByName0(InetAddress.java:1203)
at java.net.InetAddress.getAllByName(InetAddress.java:1127)
at java.net.InetAddress.getAllByName(InetAddress.java:1063)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:247)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:294)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2332)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2369)
persistence.xml:
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
version="1.0">
<persistence-unit name="Site" transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<class>org.blessedgeek.site.jaxrs.dto.Node</class>
<properties>
<property name="javax.persistence.jdbc.user" value="site" />
<property name="javax.persistence.jdbc.password" value="random" />
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/Site" />
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"></property>
</properties>
</persistence-unit>
</persistence>
maven依赖
<properties>
<resteasy.version>2.3.2.Final</resteasy.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.google.gwt</groupId>
<artifactId>gwt-user</artifactId>
<version>2.4.0</version>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
</dependency>
<dependency>
<groupId>com.smartgwt</groupId>
<artifactId>smartgwt</artifactId>
<version>3.0</version>
</dependency>
<dependency>
<groupId>com.smartgwt</groupId>
<artifactId>smartgwt-skins</artifactId>
<version>3.0</version>
</dependency>
<dependency>
<groupId>com.googlecode.mvp4g</groupId>
<artifactId>mvp4g</artifactId>
<version>1.4.0</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.18</version>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxrs</artifactId>
<version>${resteasy.version}</version>
<type>jar</type>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxb-provider</artifactId>
<version>${resteasy.version}</version>
</dependency>
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jackson-provider</artifactId>
<version>${resteasy.version}</version>
</dependency>
</dependencies>
appengine-web.xml
<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
<application></application>
<version>1</version>
<threadsafe>true</threadsafe>
<!-- Configure serving/caching of GWT files -->
<static-files>
<include path="**" />
<include path="**.nocache.*" expiration="0s" />
<include path="**.cache.*" expiration="365d" />
<exclude path="**.gwt.rpc" />
</static-files>
<system-properties>
<property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>
</system-properties>
<sessions-enabled>true</sessions-enabled>
<async-session-persistence enabled="true" />
</appengine-web-app>
web.xml
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Blessed Geek Site</display-name>
<!-- Auto scan REST service -->
<context-param>
<param-name>resteasy.scan</param-name>
<param-value>true</param-value>
</context-param>
<!-- this need same with resteasy servlet url-pattern -->
<context-param>
<param-name>resteasy.servlet.mapping.prefix</param-name>
<param-value>/site</param-value>
</context-param>
<listener>
<listener-class>
org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
</listener-class>
</listener>
<servlet>
<servlet-name>resteasy-servlet</servlet-name>
<description>JAX-RS Tools Generated - Do not modify</description>
<servlet-class>org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>resteasy-servlet</servlet-name>
<url-pattern>/site/*</url-pattern>
</servlet-mapping>
</web-app>
示例数据传输对象类
@Entity
@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement (name="node")
@XmlType(propOrder = { "id", "name", "description", "iconURL", "parentID", "active", "type"})
public class Node
implements Serializable{
public enum Type{
VIEW, ROOTNode, FOLDER, LEAF
}
@XmlAttribute
@Id
@GeneratedValue
private Long id;
@XmlAttribute
private String name;
@XmlAttribute
private String description;
@XmlAttribute
private String iconURL;
@XmlAttribute
private long parentID;
@XmlAttribute
private boolean active;
@XmlAttribute
@Enumerated(EnumType.STRING)
private Type type;
public Node() {
super();
}
public Node(String name, String description) {
super();
this.name = name;
this.description = description;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getIconURL() {
return iconURL;
}
public void setIconURL(String iconURL) {
this.iconURL = iconURL;
}
public long getParentID() {
return parentID;
}
public void setParentID(long parentID) {
this.parentID = parentID;
}
public boolean isActive() {
return active;
}
public void setActive(boolean active) {
this.active = active;
}
public Type getType() {
return type;
}
public void setType(Type type) {
this.type = type;
}
}
更新 2012/05/16:
我也已经在 persistence.xml 中将 jdbc 驱动程序替换为 com.google.appengine.api.rdbms.AppEngineDriver。仍然遇到相同的访问控制异常。