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我已经将我的本地主机实现移至另一台服务器,并试图使用另一个mySQL DB。initContext.lookup()和mysqlDB名称之间的关系是什么?
,但我得到一个空指针异常,当我在做
dataSource.getConnection();
* 这可能是一个问题,我的JDBC驱动程序? *
堆栈跟踪:
java.lang.NullPointerException
testProject.resources.ItemsResource.getItemsBrowser(ItemsResource.java:79)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:616)
com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$TypeOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:185)
com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288)
com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1483)
com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1414)
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1363)
com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1353)
com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:414)
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)
com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:708)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
代码:
// For the browser
@GET
@Produces(MediaType.TEXT_XML)
public Item getItemHTML() {
java.sql.Connection connection;
java.sql.Statement statement;
Item item = null;
ResultSet resultSet = null;
try {
connection = dataSource.getConnection();
statement = connection.createStatement();
String query = "SELECT * FROM ITEMS WHERE itemID = " + id ;
resultSet = statement.executeQuery(query);
78线是连接=的DataSource.getConnection();
非常感谢
好吧,那不是问题,那么一个缺少jdbc驱动程序会导致错误? – flexer7661 2012-04-19 19:09:52
问题是什么?你没有讨论任何有关问题。发布错误堆栈。 – kosa 2012-04-19 19:12:18
添加错误堆栈以发布 – flexer7661 2012-04-19 19:15:16