title: Servlet.service() for servlet [dispatcherServlet] in context with path
body: <p>I am getting below error while creating spring maven rest webservice. It works fine when i use postman to test post request on the api for ocbc. But when i tried to do post request for citi, i got the following error: Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause. And in my postman it shows error: &quot;Internal Server Error&quot;, Status :&quot;500&quot;</p>
  <p>Error:</p>
  <pre><code>Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
  
  java.lang.NullPointerException: null
          at com.example.service.impl.PaymentServiceImpl.addCitiPayment(PaymentServiceImpl.java:22) ~[classes/:na]
          at com.example.controller.PaymentController.addCitiPayment(PaymentController.java:25) ~[classes/:na]
          at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
          at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
          at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
          at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
          at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197) ~[spring-web-5.3.4.jar:5.3.4]
          at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141) ~[spring-web-5.3.4.jar:5.3.4]
          at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106) ~[spring-webmvc-5.3.4.jar:5.3.4]
          at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894) ~[spring-webmvc-5.3.4.jar:5.3.4]
          at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.4.jar:5.3.4]
          at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.4.jar:5.3.4]    
          at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1060) ~[spring-webmvc-5.3.4.jar:5.3.4]
          at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:962) ~[spring-webmvc-5.3.4.jar:5.3.4]
          at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.4.jar:5.3.4]
          at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.3.4.jar:5.3.4]
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) ~[tomcat-embed-core-9.0.43.jar:4.0.FR]
          at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.4.jar:5.3.4]
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.43.jar:4.0.FR]
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.43.jar:9.0.43]
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.4.jar:5.3.4]
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.4.jar:5.3.4]
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.4.jar:5.3.4]
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.4.jar:5.3.4]
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.4.jar:5.3.4]
          at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.4.jar:5.3.4]
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:887) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1684) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) ~[na:na]
          at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) ~[na:na]
          at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.43.jar:9.0.43]
          at java.base/java.lang.Thread.run(Thread.java:832) ~[na:na]
  </code></pre>
  <p>Here is my code:</p>
  <p><strong>BankOCBCDAO</strong></p>
  <pre><code>package com.example.repository;
  
  import com.example.model.BankOCBC;
  
  import org.springframework.data.jpa.repository.JpaRepository;
  import org.springframework.stereotype.Repository;
  
  @Repository
  public interface BankOCBCDAO extends JpaRepository&lt;BankOCBC, Integer&gt;{
  
  }
  </code></pre>
  <p><strong>BankCitiBankDAO</strong></p>
  <pre><code>package com.example.repository;
  
  import com.example.model.BankCitiBank;
  
  import org.springframework.data.jpa.repository.JpaRepository;
  import org.springframework.stereotype.Repository;
  
  @Repository
  public interface BankCitiBankDAO extends JpaRepository&lt;BankCitiBank, Integer&gt;{
  
  }
  </code></pre>
  <p><strong>PaymentController</strong></p>
  <pre><code>package com.example.controller;
  
  import com.example.model.BankCitiBank;
  import com.example.model.BankOCBC;
  import com.example.service.PaymentService;
  import com.example.dto.ApiResponse;
  
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.web.bind.annotation.PostMapping;
  import org.springframework.web.bind.annotation.RequestBody;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.bind.annotation.RestController;
  
  
  @RestController
  @RequestMapping(path=&quot;/payment&quot;)
  public class PaymentController {
      
      @Autowired
      private PaymentService paymentService;
  
      
      @PostMapping(&quot;/citi&quot;)
      public ApiResponse addCitiPayment(@RequestBody BankCitiBank bankCitiBank) {
          return paymentService.addCitiPayment(bankCitiBank);
      }
  
      @PostMapping(&quot;/ocbc&quot;)
      public ApiResponse addOCBCPayment(@RequestBody BankOCBC bankOCBC) {
          return paymentService.addOCBCPayment(bankOCBC);
      }
  }
  </code></pre>
  <p><strong>PaymentService</strong></p>
  <pre><code>package com.example.service;
  
  import com.example.model.BankCitiBank;
  import com.example.model.BankOCBC;
  import com.example.dto.ApiResponse;
  
  public interface PaymentService {
      ApiResponse addCitiPayment(BankCitiBank bankCitiBank);
      ApiResponse addOCBCPayment(BankOCBC bankOCBC);
  }
  </code></pre>
  <p><strong>PaymentServiceImpl</strong></p>
  <pre><code>package com.example.service.impl;
  
  import com.example.dto.ApiResponse;
  import com.example.model.BankCitiBank;
  import com.example.model.BankOCBC;
  import com.example.service.PaymentService;
  import com.example.repository.BankCitiBankDAO;
  import com.example.repository.BankOCBCDAO;
  
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.stereotype.Service;
  
  
  @Service
  public class PaymentServiceImpl implements PaymentService{
      @Autowired
      private BankOCBCDAO bankOCBCDAO;
      private BankCitiBankDAO bankCitiBankDAO;
      
      @Override
      public ApiResponse addCitiPayment(BankCitiBank bankCitiBank) {
          bankCitiBankDAO.save(bankCitiBank);
          return new ApiResponse(200, &quot;CitiBank Payment Successful&quot;, null); 
      }
  
      @Override
      public ApiResponse addOCBCPayment(BankOCBC bankOCBC) {
          bankOCBCDAO.save(bankOCBC);
          return new ApiResponse(200, &quot;OCBC Payment Successful&quot;, null); 
          
      }
      
  }
  </code></pre>
  <p>Please advise what is wrong in my code. Thanks in advance.</p>
  <p>Also can i ask if there any recommendation ways to encrypt the data value obtained from api before added into the database.</p>