Request processing failed; nested exception is java.lang.NullPointerException: Input string was null.

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Andres Navarro

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Nov 26, 2014, 12:13:53 PM11/26/14

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Hey guys,

I putting together my first JSON-RPC web service using your framework and got this error.

I'm not sure what is this about but I went over the mini tutorial you have (https://github.com/briandilley/jsonrpc4j) and everything looks OK.

I'm using 1.1 version with Spring and "Auto Discovery With Annotations".

Here is my interface:

@JsonRpcService("/jsonrpc")

public interface TickerListService {

@JsonRpcMethod("getTickerLists")

public List<TickerList> getTickerLists(@JsonRpcParam("custCode") final String custCode);

....

and here is my implementation:

@Component

public class TickerListServiceImpl implements TickerListService {

@Override

public List<TickerList> getTickerLists(final String custCode) {

return tickerListDAOImpl.getTickerLists(custCode);

}

here is my application context xml entry:

And here is my request from a browser:

http://localhost:8080/TickerListService/jsonrpc?{"jsonrpc":"2.0", "method": "getTickerLists", "params": { "custCode": ["EXAMPLE"] }, "id":1}

This is the error I'm getting back:

SEVERE: Servlet.service() for servlet [spring] in context with path [/TickerListService] threw exception [Request processing failed; nested exception is java.lang.NullPointerException: Input string was null.] with root cause

java.lang.NullPointerException: Input string was null.

at com.googlecode.jsonrpc4j.Base64.decode(Base64.java:1379)

at com.googlecode.jsonrpc4j.Base64.decode(Base64.java:1357)

at com.googlecode.jsonrpc4j.JsonRpcServer.createInputStream(JsonRpcServer.java:246)

at com.googlecode.jsonrpc4j.JsonRpcServer.handle(JsonRpcServer.java:195)

at com.googlecode.jsonrpc4j.spring.JsonServiceExporter.handleRequest(JsonServiceExporter.java:40)

at org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter.handle(HttpRequestHandlerAdapter.java:49)

at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)

at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)

at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)

at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)

at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)

at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)