DataInputStream communicating over the socket BUT reading Garabage

Question

I have written client/server applications. The client is written in Java and the Server in c++. There is a problem when I send data from the server to the client. Initially, I can recieve the data fine, however on the second read, I start to get all these garbage values. I'm not sure why this could be. Here is a look at the Java code. ostream1 and istream1 are used from the DataInputStream class. Can anybody give me any suggestions. Thanks.
     addr=Address.toString();
     ostream1.writeLong(addr.length());
     ostream1.writeBytes(addr);
     ostream1.flush();
while(istream1.readInt() != -100000); //used as handshake with c++
ostream1.writeLong(-9999); //used as handshake with c++
ostream1.flush(); //two previous lines work fine.
w=npanele.getWidth();
     h=npanele.getHeight();
     ostream1.writeLong(4);
     ostream1.writeLong(w); //send the width and height in pixels
     ostream1.writeLong(h);
     ostream1.flush();
while(istream1.readInt() != -100000); //starts to read garbage here
//never reads the -100000 sent by the server.
ostream1.writeLong(-9999);
ostream1.flush();

Answer 1

No, that cannot be it because it reads in all the previous information fine. And I used the same data types through out my code. It seems as though java client and c++ server are not synchronized with one another. That is why I check for the -100000. It's a sort of handshake implementation.... I send one long value from c++ and then in the java code I had to call the readInt() in a while loop as opposed to calling it just one time and getting the correct value which is what should happen. It calls the readInt() function maybe 12 times before exiting the program and everytime it calls the function, I get some wierd value. Anyway, I guess I will just keep on running thru the code until I can figure out what's going on.