URISyntaxException when using "[" brackets in query string

When using brackets in url query strings an exception is thrown.

java.net.URISyntaxException: Illegal character in path at index 27: http://localhost:8081/Leaf/[?userId='123'][/priority]

Stacktrace:

380507 [http-8080-1] INFO org.apache.wink.common.internal.application.ApplicationFileLoader - Loading application from META-INF/core/wink-providers.
380535 [http-8080-1] INFO org.apache.wink.client.internal.ResourceImpl - Issuing client GET method request to URI at http://localhost:8081/Twig/?user.guid='123' with null entity class and CaseInsensitiveMultivaluedMap [map=[Accept=application/json]] headers
Nov 20, 2009 5:17:10 AM org.apache.catalina.core.ApplicationContext log
SEVERE: Exception while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract java.util.Map com.mytwig.twig.client.TwigService.getTwig(java.lang.String)' threw an unexpected exception: java.lang.IllegalArgumentException
at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:360)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:546)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:166)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Thread.java:636)
Caused by: java.lang.IllegalArgumentException
at java.net.URI.create(URI.java:859)
at org.apache.wink.client.RestClient.resource(RestClient.java:113)
at com.mytwig.twig.server.TwigServiceImpl.getTwig(TwigServiceImpl.java:54)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:527)
... 16 more
Caused by: java.net.URISyntaxException: Illegal character in path at index 27: http://localhost:8081/Leaf/[?userId='123'][/priority]
at java.net.URI$Parser.fail(URI.java:2825)
at java.net.URI$Parser.checkChars(URI.java:2998)
at java.net.URI$Parser.parseHierarchical(URI.java:3082)
at java.net.URI$Parser.parse(URI.java:3030)
at java.net.URI.<init>(URI.java:595)
at java.net.URI.create(URI.java:857)
... 23 more