RMI: ClassNotFoundException

C

cdvr

I am trying to setup a basic client/server, in which the server
returns a List of Row objects. My directory structure is...

C:\code\bin\
server\
Server.class
client\
Client.class
data\
Row.class
RowCreator.class
DefaultRowCreator.class

The RowCreator interface extends the rmi.Remote interface and has one
method, createRows. DefaultRowCreator is a concrete implementation of
RowCreator. Row is the data object which gets returned in a List by
RowCreator.

The server looks like....

RowCreator creator = new TableDataCreator();
RowCreator stub = (RowCreator)
UnicastRemoteObject.exportObject(creator, 0);
Registry registry = LocateRegistry.getRegistry();
registry.bind("row_creator", stub);

So I have the classes all compiled, and I open a command prompt to the
"bin" directory.

c:\code\bin> start rmiregistry
c:\code\bin> java -claspath . server.Server

I get the following...
java.rmi.ServerException: RemoteException occurred in server thread;
nested exce
ption is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested
excep
tion is:
java.lang.ClassNotFoundException: data.RowCreator
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:
385
)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:240)
at sun.rmi.transport.Transport$1.run(Transport.java:153)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:
4
66)
at sun.rmi.transport.tcp.TCPTransport
$ConnectionHandler.run(TCPTransport
..java:707)
at java.lang.Thread.run(Thread.java:595)
at
sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(Unknow
n Source)
at sun.rmi.transport.StreamRemoteCall.executeCall(Unknown Source)
at sun.rmi.server.UnicastRef.invoke(Unknown Source)
at sun.rmi.registry.RegistryImpl_Stub.bind(Unknown Source)
at server.DefaultServer.setupRMI(DefaultServer.java:31)
at Main.main(Main.java:33)
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments;
nested ex
ception is:
java.lang.ClassNotFoundException: data.RowCreator
at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source)
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:
375
)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:240)
at sun.rmi.transport.Transport$1.run(Transport.java:153)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:
4
66)
at sun.rmi.transport.tcp.TCPTransport
$ConnectionHandler.run(TCPTransport
..java:707)
at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.ClassNotFoundException: data.RowCreator
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:242)
at sun.rmi.server.LoaderHandler.loadProxyInterfaces(LoaderHandler.java:
7
07)
at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:651)
at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:588)
at java.rmi.server.RMIClassLoader$2.loadProxyClass(RMIClassLoader.java:
6
28)
at java.rmi.server.RMIClassLoader.loadProxyClass(RMIClassLoader.java:
294
)
at
sun.rmi.server.MarshalInputStream.resolveProxyClass(MarshalInputStrea
m.java:238)
at java.io_ObjectInputStream.readProxyDesc(ObjectInputStream.java:
1500)
at java.io_ObjectInputStream.readClassDesc(ObjectInputStream.java:
1463)
at java.io_ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:
1
699)
at java.io_ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io_ObjectInputStream.readObject(ObjectInputStream.java:348)
.... 9 more

Why can't it find data.RowCreator? It is definitely in there.

Thanks!
 
?

=?ISO-8859-1?Q?Arne_Vajh=F8j?=

cdvr said:
I am trying to setup a basic client/server, in which the server
returns a List of Row objects. My directory structure is...

C:\code\bin\
server\
Server.class
client\
Client.class
data\
Row.class
RowCreator.class
DefaultRowCreator.class

The RowCreator interface extends the rmi.Remote interface and has one
method, createRows. DefaultRowCreator is a concrete implementation of
RowCreator. Row is the data object which gets returned in a List by
RowCreator.

The server looks like....

RowCreator creator = new TableDataCreator();
RowCreator stub = (RowCreator)
UnicastRemoteObject.exportObject(creator, 0);
Registry registry = LocateRegistry.getRegistry();
registry.bind("row_creator", stub);

So I have the classes all compiled, and I open a command prompt to the
"bin" directory.

c:\code\bin> start rmiregistry
c:\code\bin> java -claspath . server.Server

I get the following...
java.rmi.ServerException: RemoteException occurred in server thread;
nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested
exception is:
java.lang.ClassNotFoundException: data.RowCreator
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java: 385)
Click to expand...
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments;
nested exception is:
java.lang.ClassNotFoundException: data.RowCreator
at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source)
Click to expand...

Try:

start rmiregistry -J-classpath -J.

Arne
 
C

cdvr

Try:
start rmiregistry -J-classpath -J.

Arne- Hide quoted text -
Click to expand...

Thanks that worked for the server.

I start the client like:

c:\code\bin> java -classpath . Client 192.168.1.101 1900

try {
Registry registry = LocateRegistry.getRegistry("192.168.1.101",
1900);
return (RowCreator) registry.lookup("row_creator");
} catch (Exception e) {
System.err.println(remoteName + " exception:");
e.printStackTrace();
}

Now the client gets

java.rmi.ConnectException: Connection refused to host: 192.168.1.101;
nested exc
eption is:
java.net.ConnectException: Connection refused: connect
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(Unknown Source)
at sun.rmi.transport.tcp.TCPChannel.createConnection(Unknown
Source)
at sun.rmi.transport.tcp.TCPChannel.newConnection(Unknown
Source)
at sun.rmi.server.UnicastRef.newCall(Unknown Source)
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
at client.ClientFrame.setupRMI(ClientFrame.java:146)
at client.ClientFrame.<init>(ClientFrame.java:61)
at Main$1.run(Main.java:44)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown
Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at
sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(Unknown S
ource)
at
sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(Unknown S
ource)

FYI, I am running the server and client on the same machine. When
running the client I tried changing from 192.168.1.101 to 127.0.0.1
and to localhost. Same error each time. Am I missing something?

thanks.
 
?

=?ISO-8859-1?Q?Arne_Vajh=F8j?=

cdvr said:
I start the client like:

c:\code\bin> java -classpath . Client 192.168.1.101 1900

try {
Registry registry = LocateRegistry.getRegistry("192.168.1.101",
1900);
return (RowCreator) registry.lookup("row_creator");
} catch (Exception e) {
System.err.println(remoteName + " exception:");
e.printStackTrace();
}

Now the client gets

java.rmi.ConnectException: Connection refused to host: 192.168.1.101;
nested exc
eption is:
java.net.ConnectException: Connection refused: connect

FYI, I am running the server and client on the same machine. When
running the client I tried changing from 192.168.1.101 to 127.0.0.1
and to localhost. Same error each time. Am I missing something?
Click to expand...

Could be a software firewall blocking the port.

Arne
 
E

Esmond Pitt

cdvr said:
Registry registry = LocateRegistry.getRegistry("192.168.1.101", 1900);
Now the client gets

java.rmi.ConnectException: Connection refused to host: 192.168.1.101;
Click to expand...

This means that either there is no Registry running at port 1900 of the
host 192.168.1.101, or there is a firewall in the way.
 
C

cdvr

This means that either there is no Registry running at port 1900 of the
host 192.168.1.101, or there is a firewall in the way.
Click to expand...


Well I found out that something else was using port 1900, so I started
it on a different port. my next question is how can I bundle my app
as a jar such that is starts up rmiregistry for me instead of having
to have someone open up a command prompt, run rmiregistry, then open
another prompt and run the app. this is on windows by the way.

thanks
 
?

=?ISO-8859-1?Q?Arne_Vajh=F8j?=

cdvr said:
Well I found out that something else was using port 1900, so I started
it on a different port.
:)

my next question is how can I bundle my app
as a jar such that is starts up rmiregistry for me instead of having
to have someone open up a command prompt, run rmiregistry, then open
another prompt and run the app.
Click to expand...

Run the rmiregistry within your server app.

Arne
 
E

Esmond Pitt

cdvr said:
Well I found out that something else was using port 1900, so I started
it on a different port.
Click to expand...

Something wrong with 1099? the default RMI Registry port? which has been
reserved for RMI by IANA for ten years?
my next question is how can I bundle my app
as a jar such that is starts up rmiregistry for me instead of having
to have someone open up a command prompt, run rmiregistry, then open
another prompt and run the app. this is on windows by the way.
Click to expand...

java.rmi.registry.LocateRegistry.createRegistry()
 

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