I have a Java application which I am in the process of converting to work with WebStart. It is supposed to connect to a server to do some authentication using Naming.lookup and this works fine when running as a standalone app. Unfortunately when running the same code as a WebStart app the call fails and throws:
java.rmi.ConnectIOException: error during JRMP connection establishment; nested exception is:
java.io.EOFException
This indicates an error at the Registry, possibly a security problem. You need to run the Registry with some debugging parameters to see what, such as -Djava.rmi.server.logCalls etc. See the properties pages linked from the RMI Home Page.
Related
I'm using IntelliJ IDEA to implement the Spring Guide for consuming REST services
https://spring.io/guides/gs/consuming-rest/
When I run the Application class I receive the following error
Exception in thread "main" org.springframework.web.client.ResourceAccessException:
I/O error on GET request for "https://gturnquist-quoters.cfapps.io/api/random":
gturnquist-quoters.cfapps.io;
nested exception is
java.net.UnknownHostException: gturnquist-quoters.cfapps.io
The URL itself (https://gturnquist-quoters.cfapps.io/api/random) opens fine in a browser and my HTTP Proxy settings in IntelliJ can connect to the site without any issues. Why would an UnknownHostException be thrown here?
Hey I know this is a bit late, but here is what I had to do to resolve this issue. Even if you are using system proxies, for whatever reason, using this type of GET request requires you to build out a proxy to use in the call, like so.
Example Image
I'm running a Java server (Jetty, to be specific) on an AWS EC2 instance using WebSocket to connect to a client's browser. When I do this locally (hosting the server on my computer, not AWS), it runs fine. However, when I move the code to an EC2 instance, I get the following error message on the client-side:
WebSocket connection to 'ws://Elastic_IP:8080/?username=name_of_user' failed: Error during WebSocket handshake: Unexpected response code: 500
I made sure that the EC2 instance will accept traffic on port 8080.
On the server-side, I'm getting many java.lang.NoClassDefFoundError when the connection is attempted. I do not get these error when I run it locally. Perhaps there's an issue when I'm compiling on the EC2 instance, however it does compile without error. I'm compiling and running the code using Eclipse locally, but I'm compiling and running the code on EC2 by hand (javac with lots of classpaths). It's likely that I made an error when compiling by hand, but I'm not sure what the error could be.
Any help would be greatly appreciated.
EDIT
After a little trouble-shooting on my own, I realized that JSON.ParseException was the source of issue. After I removed all calls to this class from the server code, the handshake completed and I was able to establish a connection between the server and the client.
However, I am now running into the following error when I receive a message from the client:
WARN:MyWebSocketHandler:qtp990368553-16: Unhandled Error (closing connection)
java.lang.RuntimeException: Cannot call method public void
MyWebSocketHandler#onMessage(org.eclipse.jetty.websocket.api.Session, java.lang.String) with args:
[org.eclipse.jetty.websocket.common.WebSocketSession, java.lang.String]
It seems that I defined the argument to be org.eclipse.jetty.websocket.api.Session, but during runtime the argument is actually org.eclipse.jetty.websocket.common.WebSocketSession. Any ideas on how this is happening or which one (Session vs WebSocketSession) I should use? The only capability I need is to send strings between the server and the client.
I figured out a possible solution to my problem. Through Eclipse, I can Export the Java project to a runnable jar ("packing" the libraries into the jar). Then running it with java -jar <jar_filename> will work on the server and function the same as on the local machine. However, I've notice some performance issues (slow start), so I do not think this is the best solution, however it is a solution.
First of all, my error is almost identical to what is reported in this question: WSDLException : An error occurred trying to resolve schema referenced at
Here is a snippet of my stack dump:
javax.wsdl.WSDLException: WSDLException (at /definitions/types/xs:schema/xs:schema): faultCode=OTHER_ERROR: An error occurred trying to resolve schema referenced at 'http://www.w3.org/2005/05/xmlmime', relative to 'http://server.subdom.domain.com:13080/SM/7/Common.xsd'.: java.net.ConnectException: Connection timed out: connect] MDC{}
2015-05-24 14:36:33,751 ERROR (c.d.g.w.c.ContexteApplicatif.contextInitialized) [main] catching MDC{}
javax.xml.rpc.ServiceException: Error processing WSDL document:
javax.wsdl.WSDLException: WSDLException (at /definitions/types/xs:schema/xs:schema): faultCode=OTHER_ERROR: An error occurred trying to resolve schema referenced at 'http://www.w3.org/2005/05/xmlmime', relative to 'http://server.subdom.domain.com:13080/SM/7/Common.xsd'.: java.net.ConnectException: Connection timed out: connect
at org.apache.axis.client.Service.initService(Service.java:250) ~[axis-1.4.jar:?]
This occurs in my embedded Tomcat server running from within Eclipse. It is running on a Windows machine and there is an httpProxy at the system level. However, the URL is an internal address for which no proxy is needed. Anyhow, I implemented programmatically a proxy with the following code just before the reference to the WSDL file:
System.setProperty("http.proxySet", "true");
System.setProperty("http.proxyHost", "proxyhost.subdom.domain.com");
System.setProperty("http.proxyPort", "8080");
System.setProperty("https.proxyHost", "proxyhost.subdom.domain.com");
System.setProperty("https.proxyPort", "8080");
And now I am getting an HTTP 502 error which indicate a bad gateway. So, I suppose this solution is the wrong one since I shouldn't need a proxy in first place. I can access the page from within a browser, indistinctly if I enable or disable the proxy settings. In addition, there is a script to configure the proxy and if I use the proxy host shown above and hardcode it in my browser instead of "system proxy" or "automatic setting" I cannot access the page.
To summarize, it behaves like there is like it needs a proxy setup, however it doesn't. The problem is elsewhere and I have no idea how I can make significant progress to debug this problem.
Any hints? Something with Tomcat? Something with Eclipse?
I haven't tried yet on a standalone Tomcat server since my code is not yet ready for deployement.
NOTE: BTW, I tried the command from the quoted post and I am getting the same error as well. Connect timed out without system properties defined for the proxy and 502 code otherwise. At the same time, if I am launching the Web Service Explorer from Eclipse I am perfectly able to access the webservice and invoke operations.
Further investigation: I decided to use WireShark to see what is going on with the request and it appears both HTTP requests (the wsdl and the common types definitions) were fulfilled without a glitch and no connection timed out at all, not a single error. I can see the XML in WireShark and the HTTP status is 200 OK and everything is perfectly fine at this level.
So, what is going on here? I have the same problem on a Linux server while the message is a bit different. What wsdl2java is doing to believe there was a problem and abort?
After further investigation and testing with Axis2 and CXF, I finally found the problem, thanks to the CXF's version of the wsdl2java script which is giving a bit more details.
First of all, the original solution proposed was almost correct. I actually need to add all the proxy information, however I also needed to specify the non-proxy hosts otherwise I am getting the 502 error. The messages from the Axis script were not very detailed about the offending request, while CXF's version was very clear and enabled me to finally solve my problem.
So, in addition, if you modify the wsdl2java script, add -Dhttp.nonProxyHosts=... in addition to other options. The same thing if you need to specify a proxy programmatically.
I'm currently using a Java library via jni4net in a C# application running on IIS Express, and the Java library is throwing an exception. Is it possible to attach a debugger to debug the Java code?
Attempt:
I tried to add the following to the JVM options as per the instructions provided by IntelliJ:
setup.AddJVMOption("-agentlib", "-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5005");
but get an exception:
Unable to open debugger port : java.net.ConnectException "Connection refused: connect"
By setting the AddJVMOption-String to:
setup.AddJVMOption("-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=1044");
I am able to connect to the jni4net part via Eclipse, maybe you should just omit the first argument ("-agentlib", ...)
When I use setup.AddJVMOption("-agentlib", "-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5005");
I get an Exception in CreateJVM
I'm getting the following error when i'm trying to connect via RMI to a JBoss application
javax.naming.CommunicationException [Root exception is java.lang.ClassNotFoundException: org.jboss.proxy.ClientContainer]
This error occurs only after enabling IPtables on a linux server.
At the moment, we use this application as a logging tool between 2 servers, but it all Ports to be open because RMI uses random ports for the export of objects if i'm not mistaken
We have tested with some small test applications and the following is a viable solution when using firewalls with RMI:
UnicastRemoteObject.exportObject(server, 1244);
I export the object over port 1244
The following ports are open at this moment:
1244: The RMI-export object
1066: Binding with RMI on the server
1099: Registering on the management server
Is there anybody that could push me in the right direction to get this implementation working?
Thanks in advance!