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    #1

    Uncaught JavaScript exceptions in FF and Chrome

    Hi folks,

    I have a project that uses XMLTools.loadWSDL to load a WSDL. To avoid the SOP I also have a HttpProxy servlet that fetches the WSDL from a remote server. When the remote server is reachable, everything works fine. However, in Gwt DevMode, when the remote server is not reachable, FireFox reports an error:
    Code:
    [ERROR] Uncaught JavaScript exception [uncaught exception: [Exception... "Cannot modify properties of a WrappedNative"  nsresult: "0x80570034 (NS_ERROR_XPC_CANT_MODIFY_PROP_ON_WN)"  location: "JS frame :: http://127.0.0.1:8888/gwt_smartgwtdemo/sc/modules/ISC_Core.js :: <TOP_LEVEL> :: line 911"  data: no]] in , line 0
    This might result from a bug in FF: https://bugzilla.mozilla.org/show_bug.cgi?id=428602
    but switching to chrome does not improve things much:
    Code:
    [ERROR] Uncaught JavaScript exception [Uncaught TypeError: Cannot set property 'location' of undefined] in http://127.0.0.1:8888/gwt_smartgwtdemo/sc/modules/ISC_Core.js, line 301
    I’m new to SmartGwt so I assume I’m doing something wrong and hope one of you experts out there can help me with a fix or workaround.

    The stack I’m using is: SmartGwt 3.0, GWT 2.4, Java 1.6.0_31 on OSX 10.6.8 with FireFox 11.0 and Chrome 20.0.1132.47. Right after the above mentioned error is discovered, I can start the SmartClient Developer Console in FireFox. It reports the SmartClient version as: SmartClient Version: SC_SNAPSHOT-2011-12-05/LGPL Development Only (built 2011-12-05)

    The SmartClient Developer Console appears to shows no real issues:
    Code:
    09:10:45.233:INFO:Log:initialized
09:10:45.248:WARN:Log:NOTE: Firebug is enabled. Firebug greatly slows the performance of applications that make heavy use of JavaScript. Isomorphic highly recommends Firebug for troubleshooting, but Firebug and other development tools should be disabled when assessing the real-world performance of SmartClient applications.
09:10:47.075:SCR3:INFO:Log:isc.Page is loaded
    To complete the post I’ll include the stripped down project files that demonstrate the error (but do nothing very useful). These include the host page index.html, the GWT module SmartGwtDemo.gwt.xml, the client-side class AppLoader.java (which does nothing other than load the wsdl), the server-side class HttpProxySapServlet.java (which now returns either (a) 200 with a hard-coded wsdl instead of fetching it remotely, or (b) 503 with an error message), web.xml and pom.xml for maven 3.0.3.

    If I've forgotten anything, please let me know.

    Sincere thanks for your help!!

    Index.html
    Code:
    <!DOCTYPE html>
<html>
<head>
	<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
	<title>SmartGwtDemo</title>
	<link rel="shortcut icon" href="images/favicon.ico" />
	<script> var isomorphicDir = "gwt_smartgwtdemo/sc/"; </script>   
	<script>window.isc_useSimpleNames = false</script> 
	<script type="text/javascript" 	src="gwt_smartgwtdemo/gwt_smartgwtdemo.nocache.js"></script>
</head>
<body id="page">
	<iframe src="javascript:''" id="__gwt_historyFrame" tabIndex='-1' style="position:absolute;width:0;height:0;border:0"></iframe>
	<noscript>
		<div style="width: 22em; position: absolute; left: 50%; margin-left: -11em; color: red; background-color: white; border: 1px solid red; padding: 4px; font-family: sans-serif">
			Your web browser must have JavaScript enabled in order for this application to display correctly.
		</div>
	</noscript>
</body>
</html>
    SmartGwtDemo.gwt.xml
    Code:
    <?xml version="1.0" encoding="UTF-8"?>
<module rename-to='gwt_smartgwtdemo'>  <!-- The gwt javascript output will reside in war/gwt_smartgwt -->
	
	<source path='client' />
	<source path='shared' />
	<source path='test' />
		
	<inherits name="com.google.gwt.resources.Resources" />
	
	<inherits name="com.smartgwt.SmartGwt" />
	<inherits name="com.smartclient.theme.enterprise.Enterprise" />
	<inherits name="com.smartclient.theme.enterprise.EnterpriseResources" />
	<inherits name="com.smartgwt.tools.SmartGwtTools" />

	<!-- When using SmartGWT, the entry-point must be included AFTER the inherit's tag (above)  -->
	<entry-point class='de.jaemc.smartgwtdemo.client.AppLoader' />

	<!--  Client-side logging -->	
	<inherits name="com.allen_sauer.gwt.log.gwt-log-DEBUG" />
	<set-property name="log_DivLogger" value="DISABLED" />

	<set-configuration-property name="document.compatMode" value="CSS1Compat"/>
	
</module>
    AppLoader.java:
    Code:
    package de.jaemc.smartgwtdemo.client;

import com.google.gwt.core.client.EntryPoint;

public class AppLoader implements EntryPoint {

	private String gwtAppName = "/smartgwtdemo";

	@Override
	public void onModuleLoad() {

		RPCManager.setHandleTransportErrorCallback(new HandleTransportErrorCallback() {
			public void handleTransportError(int transactionNum, int status, int httpResponseCode, String httpResponseText) {
				SC.clearPrompt();
				SC.warn("Call to server failed : " + httpResponseCode + " : "+ httpResponseText, new BooleanCallback() {
					@Override
					public void execute(Boolean value) {}
				});
			}
		});	
		
		if (com.google.gwt.user.client.Window.Location.getHref().indexOf("gwt.codesvr") >= 0) gwtAppName = "";
		final String wsdlURL = gwtAppName + "/sap/bc/soap/wsdl/?services=RFC_FUNCTION_SEARCH";
		SC.say("SmartGwtDemo","Attempting to load :" + wsdlURL);

	    final RPCRequest rpc = new RPCRequest();
	    rpc.setShowPrompt(false);
	    rpc.setWillHandleError(true);
	    rpc.setUseSimpleHttp(true);
	    XMLTools.loadWSDL(wsdlURL, new WSDLLoadCallback() {
			@Override
			public void execute(WebService service) {
				SC.clearPrompt();
				if (service == null) {
					SC.warn("Failed to load " + wsdlURL, new BooleanCallback() {
						@Override 
						public void execute(Boolean value) {}
					});
					return;
				}else{
					SC.say("SmartGwtDemo","Successfully loaded :" + wsdlURL);
				}
			}
		},rpc,true);
	}
}
    HttpProxySapServlet.java:
    Code:
    package de.jaemc.smartgwtdemo.server;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HttpProxySapServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	public void doGet(HttpServletRequest request, HttpServletResponse response) {
		Long now = new Date().getTime();
		response.addHeader("Content-Type", "text/xml; charset=utf-8");
		response.addDateHeader("Last-Modified", now);
		response.addDateHeader("Date", now);
		response.addDateHeader("Expires", now);
		response.addHeader("Cache-Control", "private, max-age=0, no-cache, no-store");
		response.addHeader("X-Content-Type-Options", "nosniff");

//		doSucceed(request, response);
		doFail(request, response);
	}
	
	public void doSucceed(HttpServletRequest request, HttpServletResponse response) {
		PrintWriter out;
		try {
			response.setStatus(HttpServletResponse.SC_OK);
			out = response.getWriter();
			out.println(getWsdlString());
			out.close();
		} catch (IOException e) {
			response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
		}
	}

	public void doFail(HttpServletRequest request, HttpServletResponse response) {
		PrintWriter out;
		try {
			response.setStatus(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
			out = response.getWriter();
			out.println("The remote service is unavailable");
			out.close();
		} catch (IOException e) {
			response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
		}
	}
	private String getWsdlString(){
		return "<?xml version=\"1.0\" encoding=\"UTF-8\"?><definitions targetNamespace=\"urn:sap-com:document:sap:rfc:functions\" xmlns:s0=\"urn:sap-com:document:sap:rfc:functions\" xmlns=\"http://schemas.xmlsoap.org/wsdl/\" xmlns:http=\"http://schemas.xmlsoap.org/wsdl/http/\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/wsdl/soap/\"><types><xsd:schema targetNamespace=\"urn:sap-com:document:sap:rfc:functions\"><xsd:element name=\"RFC_FUNCTION_SEARCH\"><xsd:complexType><xsd:all><xsd:element name=\"FUNCNAME\"><xsd:simpleType><xsd:restriction base=\"xsd:string\"><xsd:maxLength value=\"30\"/></xsd:restriction></xsd:simpleType></xsd:element><xsd:element name=\"FUNCTIONS\"><xsd:complexType><xsd:sequence><xsd:element maxOccurs=\"unbounded\" minOccurs=\"0\" name=\"item\" type=\"s0:RFCFUNC\"/></xsd:sequence></xsd:complexType></xsd:element><xsd:element minOccurs=\"0\" name=\"GROUPNAME\"><xsd:simpleType><xsd:restriction base=\"xsd:string\"><xsd:maxLength value=\"26\"/></xsd:restriction></xsd:simpleType></xsd:element><xsd:element minOccurs=\"0\" name=\"LANGUAGE\"><xsd:simpleType><xsd:restriction base=\"xsd:string\"><xsd:maxLength value=\"1\"/></xsd:restriction></xsd:simpleType></xsd:element></xsd:all></xsd:complexType></xsd:element><xsd:element name=\"RFC_FUNCTION_SEARCH.Response\"><xsd:complexType><xsd:all><xsd:element name=\"FUNCTIONS\"><xsd:complexType><xsd:sequence><xsd:element maxOccurs=\"unbounded\" minOccurs=\"0\" name=\"item\" type=\"s0:RFCFUNC\"/></xsd:sequence></xsd:complexType></xsd:element></xsd:all></xsd:complexType></xsd:element><xsd:complexType name=\"RFCFUNC\"><xsd:sequence><xsd:element minOccurs=\"0\" name=\"FUNCNAME\"><xsd:simpleType><xsd:restriction base=\"xsd:string\"><xsd:maxLength value=\"30\"/></xsd:restriction></xsd:simpleType></xsd:element><xsd:element minOccurs=\"0\" name=\"GROUPNAME\"><xsd:simpleType><xsd:restriction base=\"xsd:string\"><xsd:maxLength value=\"26\"/></xsd:restriction></xsd:simpleType></xsd:element><xsd:element minOccurs=\"0\" name=\"APPL\"><xsd:simpleType><xsd:restriction base=\"xsd:string\"><xsd:maxLength value=\"1\"/></xsd:restriction></xsd:simpleType></xsd:element><xsd:element minOccurs=\"0\" name=\"HOST\"><xsd:simpleType><xsd:restriction base=\"xsd:string\"><xsd:maxLength value=\"32\"/></xsd:restriction></xsd:simpleType></xsd:element><xsd:element minOccurs=\"0\" name=\"STEXT\"><xsd:simpleType><xsd:restriction base=\"xsd:string\"><xsd:maxLength value=\"74\"/></xsd:restriction></xsd:simpleType></xsd:element></xsd:sequence></xsd:complexType></xsd:schema> </types> <message name=\"RFC_FUNCTION_SEARCHOutput\"> <part name=\"parameters\" element=\"s0:RFC_FUNCTION_SEARCH.Response\"> </part> </message> <message name=\"RFC_FUNCTION_SEARCHInput\"> <part name=\"parameters\" element=\"s0:RFC_FUNCTION_SEARCH\"> </part> </message> <portType name=\"RFC_FUNCTION_SEARCHPortType\"> <operation name=\"RFC_FUNCTION_SEARCH\"> <input message=\"s0:RFC_FUNCTION_SEARCHInput\"> </input> <output message=\"s0:RFC_FUNCTION_SEARCHOutput\"> </output> </operation> </portType> <binding name=\"RFC_FUNCTION_SEARCHBinding\" type=\"s0:RFC_FUNCTION_SEARCHPortType\"> <soap:binding style=\"document\" transport=\"http://schemas.xmlsoap.org/soap/http\"/> <operation name=\"RFC_FUNCTION_SEARCH\"> <soap:operation soapAction=\"http://www.sap.com/RFC_FUNCTION_SEARCH\"/> <input> <soap:body use=\"literal\"/> </input> <output> <soap:body use=\"literal\"/> </output> </operation> </binding> <service name=\"RFC_FUNCTION_SEARCHService\"> <documentation>SAP Service RFC_FUNCTION_SEARCH via SOAP</documentation> <port name=\"RFC_FUNCTION_SEARCHPortType\" binding=\"s0:RFC_FUNCTION_SEARCHBinding\"> <soap:address location=\"http://192.168.146.128:8000/sap/bc/soap/rfc?sap-client=800\"/> </port> </service> </definitions>";
	}
}
    web.xml:
    Code:
    <?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

	<!-- Default page to serve -->
	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
	</welcome-file-list>

	<servlet>
		<servlet-name>HttpProxySapServletWsdl</servlet-name>
		<servlet-class>de.jaemc.smartgwtdemo.server.HttpProxySapServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>HttpProxySapServletWsdl</servlet-name>
		<url-pattern>/sap/bc/soap/wsdl/</url-pattern>
	</servlet-mapping>

</web-app>
    pom.xml:
    Code:
    <?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

	<modelVersion>4.0.0</modelVersion>
	<groupId>de.jaemc.smartgwtdemo</groupId>
	<artifactId>smartgwtdemo</artifactId>
	<version>1.0.7</version>
	<packaging>war</packaging>
	<name>SmartGwtDemo</name>

	<properties>
		<commons.lang3.version>3.1</commons.lang3.version>
		<gwt.version>2.4.0</gwt.version>
		<gwt.maven.plugin.version>${gwt.version}</gwt.maven.plugin.version>
		<gwt.log.version>3.1.3</gwt.log.version>
		<javax.validation.version>1.0.0.GA</javax.validation.version>
		<junit.version>4.8.2</junit.version>
		<maven.compiler.source>1.6</maven.compiler.source>
		<maven.compiler.target>1.6</maven.compiler.target>
		<maven.compiler.plugin.version>2.3.2</maven.compiler.plugin.version>
		<maven.war.plugin.version>2.1.1</maven.war.plugin.version>
		<org.springframework.version>3.0.1.RELEASE</org.springframework.version>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<org.slf4j.log4j12.version>1.6.1</org.slf4j.log4j12.version>
		<smartgwt.version>3.0</smartgwt.version>
		<webappDirectory>${project.build.directory}/${project.build.finalName}</webappDirectory>
	</properties>

	<repositories>
		<repository>
			<id>smartclient</id>
			<name>smartclient.com</name>
			<url>http://www.smartclient.com/maven2</url>
		</repository>
	</repositories>

	<build>
		<outputDirectory>${webappDirectory}/WEB-INF/classes</outputDirectory>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>${maven.compiler.plugin.version}</version>
				<configuration>
					<verbose>true</verbose>
					<fork>true</fork>
					<source>${maven.compiler.source}</source>
					<target>${maven.compiler.target}</target>
				</configuration>
			</plugin>

			<plugin>
				<groupId>org.codehaus.mojo</groupId>
				<artifactId>gwt-maven-plugin</artifactId>
				<version>${gwt.maven.plugin.version}</version>
				<executions>
					<execution>
						<goals>
							<goal>compile</goal>
							<goal>test</goal>
						</goals>
					</execution>
				</executions>
				<configuration>
					<debugPort>8999</debugPort>
					<skipTests>true</skipTests>
					<runTarget>index.html</runTarget>
					<hostedWebapp>${webappDirectory}</hostedWebapp>
					<generateDirectory>src/main/java</generateDirectory>
					<testTimeOut>60</testTimeOut>
					<mode>htmlunit</mode>
				</configuration>
			</plugin>


			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-war-plugin</artifactId>
				<version>${maven.war.plugin.version}</version>
				<executions>
					<execution>
						<phase>compile</phase>
						<goals>
							<goal>exploded</goal>
						</goals>
					</execution>
				</executions>
				<configuration>
					<webappDirectory>${webappDirectory}</webappDirectory>
					<webResources>
						<resource>
							<filtering>true</filtering>
							<directory>src/main/webapp</directory>
							<includes>
								<include>**/*.properties</include>
							</includes>
						</resource>
					</webResources>
				</configuration>
			</plugin>
		</plugins>
		
		<pluginManagement>
			<plugins>
				<!--This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself.-->
				<plugin>
					<groupId>org.eclipse.m2e</groupId>
					<artifactId>lifecycle-mapping</artifactId>
					<version>1.0.0</version>
					<configuration>
						<lifecycleMappingMetadata>
							<pluginExecutions>
								<pluginExecution>
									<pluginExecutionFilter>
										<groupId>org.apache.maven.plugins</groupId>
										<artifactId>maven-war-plugin</artifactId>
										<versionRange>[${maven.war.plugin.version},)</versionRange>
										<goals>
											<goal>exploded</goal>
										</goals>
									</pluginExecutionFilter>
									<action>
										<execute></execute>
									</action>
								</pluginExecution>
							<pluginExecution>
								<pluginExecutionFilter>
									<groupId>org.apache.maven.plugins</groupId>
									<artifactId>maven-compiler-plugin</artifactId>
									<versionRange>[${maven.compiler.plugin.version},)</versionRange>
									<goals>
										<goal>compile</goal>
										<goal>testCompile</goal>
									</goals>
								</pluginExecutionFilter>
								<action>
									<execute></execute>
								</action>
							</pluginExecution>
							</pluginExecutions>
						</lifecycleMappingMetadata>
					</configuration>
				</plugin>
			</plugins>
		</pluginManagement>
		
	</build>

	<dependencies>
		<dependency>
			<groupId>com.google.gwt</groupId>
			<artifactId>gwt-user</artifactId>
			<version>${gwt.version}</version>
 		</dependency>
	
		<dependency>
			<groupId>com.google.gwt</groupId>
			<artifactId>gwt-servlet</artifactId>
			<version>${gwt.version}</version>
			<scope>runtime</scope>
		</dependency>

		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>${junit.version}</version>
			<scope>test</scope>
		</dependency>
		
		<dependency>
			<groupId>com.smartgwt</groupId>
			<artifactId>smartgwt</artifactId>
			<version>${smartgwt.version}</version>
		</dependency>
		
		<dependency>
			<groupId>javax.validation</groupId>
			<artifactId>validation-api</artifactId>
			<version>${javax.validation.version}</version>
		</dependency>
		<dependency>
			<groupId>javax.validation</groupId>
			<artifactId>validation-api</artifactId>
			<version>${javax.validation.version}</version>
			<classifier>sources</classifier>
		</dependency>
		
		<dependency>
			<groupId>com.google.code</groupId>
			<artifactId>gwt-log</artifactId>
			<version>${gwt.log.version}</version>
			<scope>compile</scope>
		</dependency>
		
		 <dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
			<version>${org.slf4j.log4j12.version}</version>
		</dependency>
		 
		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-lang3</artifactId>
			<version>${commons.lang3.version}</version>
		</dependency>
		 		
	</dependencies>
	
</project>
    Tags: None
    #2
    You mentioned you get this error in GWT development mode - does it go away in compiled mode? If not, what error do you get in compiled mode?

    In the Developer Console we report what went wrong, and often the information is better in compiled mode than in development mode.

    Comment

      #3
      Hi Isomorphic,

      thanks for your reply and the advice to check the behavior in compiled mode.

      I compiled the stripped down project and deployed to tomcat 7. Using FF to call up http://127.0.0.1:8080/smartgwtdemo/ and then javascript:isc.showConsole() I see nothing too suspicious in the log:
      Code:
      21:11:21.568:INFO:Log:initialized
21:11:21.582:WARN:Log:NOTE: Firebug is enabled. Firebug greatly slows the performance of applications that make heavy use of JavaScript. Isomorphic highly recommends Firebug for troubleshooting, but Firebug and other development tools should be disabled when assessing the real-world performance of SmartClient applications.
21:11:22.146:SCR3:INFO:Log:isc.Page is loaded
      Repeating the call to http://127.0.0.1:8080/smartgwtdemo/ only seems to change the datetime stamps in the log, so no new information there.

      In FireBug I see my HTTP return code 503 with the error message "The remote service is unavailable", which is exactly as it should be. In fact, the only evidence I can find to show there is still a problem is this: In FireBug, under the Net tab, if I click on the call to the server to fetch the wsdl, then expand the XML tab, I see this:
      Code:
      XML Parsing Error: syntax error Location: moz-nullprincipal:{35601f6b-e485-3a4a-b453-34523214c236} Line Number 1, Column 1:

The remote service is unavailable
^
      This gives me the feeling that FF is trying to parse the error message as if it were a valid WSDL, but it's not clear to me if this is a SC or a FF issue. The Http return code (503) is not ignored because I do see the modal dialog "Call to server failed : 503 : The remote server is unavailable", so SC seems to be doing the right thing.

      Repeating the above in Chrome I see no problem at all. The 503 is shown just as expected and all works fine.

      Your tip was really a good one and makes this issue much less serious for me because I dont see any uncaught javascript errors anymore. Nonetheless, the XML Parsing Error in FF looks like evidence that something is wrong - either in firebug or SC. If I can do anything to help track this down please let me know.

      Otherwise it remains only for me to say thanks. SmartGwt is very cool and I remain totally impressed and very grateful for your help!

      Comment

        #4
        What Content-Type are you setting on the HTTP error response? Despite it being an error, if the Content-Type was text/xml, Firefox would probably try to parse it.

        Comment

          #5
          Good idea. In HttpProxySapServlet.java you can see I use response.addHeader("Content-Type", "text/xml; charset=utf-8");

          Is there an alternative?

          Comment

            #6
            Either omitting Content-Type or setting text/plain would be more correct - what you're returning in this case is clearly not valid XML, and it looks like the problem here may be that Firefox is returning us an XMLDocument that's flagged as having errors, but we're not detecting this particular type of error document.

            Comment

              #7
              You're completely right. I made this fix and tested. Now all is well. Thank you very much for finding and fixing my error. You guys are impressive! Cheers!

              Comment

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