我有一个在 JBOSS AS 7 上运行的 RESTeasy 服务，它试图创建与本地数据库（mysql 服务器）的连接。
数据源在 JBOSS 管理中正确定义并且连接良好（JSF 应用程序可以很好地连接它并且它可以修改数据库），但是当我尝试在我的 RESTeasy 服务中连接时，它给了我一个 nullPointerException 我可以' t似乎弄清楚为什么。kumonobs 是有问题的数据库。错误发生在通过post请求调用的persist方法中。任何帮助将不胜感激，如果需要任何其他信息，请询问！
@Path("/RSAndroid")
@ApplicationScoped
public class HelloWorldResource implements Serializable{
@Resource(mappedName = "java:jboss/datasources/kumonobs")
private static DataSource dataSource;
private static ArrayList<Student> students = new ArrayList<Student>();
@GET()
@Produces("text/plain")
public String sayHello() {
return stringStudents(students);
}
@POST()
@Consumes(MediaType.APPLICATION_FORM_URLENCODED)
public String postStudent(@FormParam("Student ID") String student){
Date date = new Date();
Student kumonstudent = new Student(student, date);
studentCheck(kumonstudent);
System.out.println(kumonstudent.toString());
return "OK";
}
public String stringStudents(ArrayList<Student> s){
String students = "";
for(Student student : s){
students += student.toString();
}
return students;
}
public void studentCheck(Student student){
boolean checkIn = true;
int count = 0;
for(Student s : students){
count++;
//If Student has been found in the list.
if(s.getStudentID().equals(student.getStudentID())){
//remove the student from the list.
students.remove(count-1);
// ** DO DATABASE STUFF HERE FOR REMOVING STUDENT **
checkIn = false;
break;
}
}
//If student needs to be checked in, add to list.
if(checkIn){
System.out.println(student.getDate());
students.add(student);
// ** DO DATABASE STUFF HERE FOR ADDING STUDENT **
persist(student);
}
}
//Insert student into database table.
public void persist(Student student) {
PreparedStatement stmt = null;
Connection connection = null;
try {
try {
connection = dataSource.getConnection(); //ERROR OCCURS HERE NULLPOINTER
try {
System.out.println("Fourth");
stmt = connection.prepareStatement(
"INSERT INTO checkin VALUES (?, ?)");
stmt.setString(1, "A00105010");
stmt.setString(2, "Sample Name");
stmt.executeUpdate();
} finally {
if (stmt != null) {
stmt.close();
}
}
} finally {
if (connection != null) {
connection.close();
}
}
} catch (SQLException ex) {
System.out.println("Error in persist ");
ex.printStackTrace();
}
}
}
堆
14:29:22,040 INFO [stdout] (http--0.0.0.0-8080-1) 2012-11-06
14:29:22,040 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host]. [/AndroidRS].[Resteasy]] (http--0.0.0.0-8080-1) Servlet.service() for servlet R
esteasy threw exception: org.jboss.resteasy.spi.UnhandledException: java.lang.NullPointerException
at org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationException(SynchronousDispatcher.java:340) [resteasy-jaxrs-2.3.2.Final.jar:]
at org.jboss.resteasy.core.SynchronousDispatcher.handleException(SynchronousDispatcher.java:214) [resteasy-jaxrs-2.3.2.Final.jar:]
at org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException(SynchronousDispatcher.java:190) [resteasy-jaxrs-2.3.2.Final.jar:]
at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:540) [resteasy-jaxrs-2.3.2.Final.jar:]
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:502) [resteasy-jaxrs-2.3.2.Final.jar:]
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:119) [resteasy-jaxrs-2.3.2.Final.jar:]
at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208) [resteasy-jaxrs-2.3.2.Final.jar:]
at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55) [resteasy-jaxrs-2.3.2.Final.jar:]
at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50) [resteasy-jaxrs-2.3.2.Final.jar:]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [jbossweb-7.0.13.Final.jar:]
at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153) [jboss-as-web-7.1.1.Final.jar:7.1.1.Final]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.13.Final.jar:]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) [jbossweb-7.0.13.Final.jar:]
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.13.Final.jar:]
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671) [jbossweb-7.0.13.Final.jar:]
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930) [jbossweb-7.0.13.Final.jar:]
at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_27]
Caused by: java.lang.NullPointerException
at org.jboss.samples.rs.webservices.HelloWorldResource.persist(HelloWorldResource.java:92) [classes:]
at org.jboss.samples.rs.webservices.HelloWorldResource.studentCheck(HelloWorldResource.java:81) [classes:]
at org.jboss.samples.rs.webservices.HelloWorldResource.postStudent(HelloWorldResource.java:44) [classes:]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.6.0_27]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [rt.jar:1.6.0_27]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [rt.jar:1.6.0_27]
at java.lang.reflect.Method.invoke(Method.java:597) [rt.jar:1.6.0_27]
at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:155) [resteasy-jaxrs-2.3.2.Final.jar:]
at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:257) [resteasy-jaxrs-2.3.2.Final.jar:]
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:222) [resteasy-jaxrs-2.3.2.Final.jar:]
at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:211) [resteasy-jaxrs-2.3.2.Final.jar:]
at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:525) [resteasy-jaxrs-2.3.2.Final.jar:]
... 19 more