I'm trying to use the built-in functions of GWT to serialize something
that's not going through regular RPC. I've manually created a
ClientOracle and gotten the InputStream for the <strongName>.gwt.rpc
where I got the <strongName> portion from the client. I'm using
RPC.streamResponseForSuccess to write it to a ByteArrayOutputStream.
However, I get an exception part way through serialization:
java.lang.NullPointerException
at
com.google.gwt.rpc.server.WebModePayloadSink.getBytes(WebModePayloadSink.java:
860)
at com.google.gwt.rpc.server.WebModePayloadSink
$PayloadVisitor.constructorFunction(WebModePayloadSink.java:607)
at com.google.gwt.rpc.server.WebModePayloadSink
$PayloadVisitor.visit(WebModePayloadSink.java:260)
at
com.google.gwt.rpc.client.ast.InstantiateCommand.traverse(InstantiateCommand.java:
54)
at
com.google.gwt.rpc.client.ast.RpcCommandVisitor.doAccept(RpcCommandVisitor.java:
320)
at
com.google.gwt.rpc.client.ast.RpcCommandVisitor.accept(RpcCommandVisitor.java:
42)
at com.google.gwt.rpc.server.WebModePayloadSink
$PayloadVisitor.visit(WebModePayloadSink.java:237)
at
com.google.gwt.rpc.client.ast.ArrayValueCommand.traverse(ArrayValueCommand.java:
53)
at
com.google.gwt.rpc.client.ast.RpcCommandVisitor.doAccept(RpcCommandVisitor.java:
320)
at
com.google.gwt.rpc.client.ast.RpcCommandVisitor.accept(RpcCommandVisitor.java:
42)
at com.google.gwt.rpc.server.WebModePayloadSink
$PayloadVisitor.visit(WebModePayloadSink.java:285)
at
com.google.gwt.rpc.client.ast.InstantiateCommand.traverse(InstantiateCommand.java:
54)
at
com.google.gwt.rpc.client.ast.RpcCommandVisitor.doAccept(RpcCommandVisitor.java:
320)
at
com.google.gwt.rpc.client.ast.RpcCommandVisitor.accept(RpcCommandVisitor.java:
42)
at com.google.gwt.rpc.server.WebModePayloadSink
$PayloadVisitor.visit(WebModePayloadSink.java:376)
at
com.google.gwt.rpc.client.ast.InvokeCustomFieldSerializerCommand.traverse(InvokeCustomFieldSerializerCommand.java:
76)
at
com.google.gwt.rpc.client.ast.RpcCommandVisitor.doAccept(RpcCommandVisitor.java:
320)
at
com.google.gwt.rpc.client.ast.RpcCommandVisitor.accept(RpcCommandVisitor.java:
42)
at com.google.gwt.rpc.server.WebModePayloadSink
$PayloadVisitor.visit(WebModePayloadSink.java:407)
at
com.google.gwt.rpc.client.ast.ReturnCommand.traverse(ReturnCommand.java:
44)
at
com.google.gwt.rpc.client.ast.RpcCommandVisitor.doAccept(RpcCommandVisitor.java:
320)
at
com.google.gwt.rpc.client.ast.RpcCommandVisitor.accept(RpcCommandVisitor.java:
42)
at
com.google.gwt.rpc.server.WebModePayloadSink.accept(WebModePayloadSink.java:
890)
at com.google.gwt.rpc.server.RPC.streamResponse(RPC.java:472)
at
com.google.gwt.rpc.server.RPC.streamResponseForSuccess(RPC.java:249)
Relevant code:
ClientOracle oracle = getClientOracle();
ByteArrayOutputStream out = new ByteArrayOutputStream();
RPC.streamResponseForSuccess(oracle, out, messagesToSend);
protected InputStream findClientOracleData(String
requestModuleBasePath, String permutationStrongName) throws
IOException {
String resourcePath = requestModuleBasePath +
permutationStrongName
+ ".gwt.rpc";
InputStream in =
getServletContext().getResourceAsStream(resourcePath);
if (in == null) {
throw new IOException("Could not find
ClientOracle data for
permutation " + permutationStrongName);
}
return in;
}
public ClientOracle getClientOracle() throws IOException {
String strongName = request.getParameter("StrongName");
strongName = strongName != null ? strongName.trim() :
null;
strongName = strongName != null && strongName.isEmpty()
? null :
strongName;
if (strongName == null) {
return null;
}
if ("HostedMode".equals(strongName)) {
return new HostedModeClientOracle();
} else {
String moduleBase =
request.getParameter("ModuleBase");
if (moduleBase == null) {
return null;
}
String basePath = new URL(moduleBase).getPath();
if (basePath == null) {
throw new
MalformedURLException("Blocked request without GWT base
path parameter (XSRF attack?)");
}
String contextPath =
getServletContext().getContextPath();
if (!basePath.startsWith(contextPath)) {
throw new
MalformedURLException("Blocked request with invalid GWT
base path parameter (XSRF attack?)");
}
basePath =
basePath.substring(contextPath.length());
InputStream in = findClientOracleData(basePath,
strongName);
return WebModeClientOracle.load(in);
}
}
--
You received this message because you are subscribed to the Google Groups
"Google Web Toolkit" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/google-web-toolkit?hl=en.
