Found that we are getting heap space problem from the JSch code. Here is
the stack trace.
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at com.jcraft.jsch.Buffer.getString(Buffer.java:167)
at com.jcraft.jsch.Session.read(Session.java:889)
at
com.jcraft.jsch.UserAuthPassword.start(UserAuthPassword.java:86)
at com.jcraft.jsch.Session.connect(Session.java:419)
This Problem is happening rarely and also for some specific SSH Servers.
I have looked at the Jsch source code and found that getString() is
allocating a buffer of size found from getInt(). For these specific
servers, getInt() value obtained has to be too large to cause it
OutOfMemoryError. I dont have much resources/lab connection to further
debug with the servers having this problem with a modified source code.
Is it known issue? Any suggestiions/hints on how to resolve/fix the
issue? Does upgrade to latest Jsch will fix it?
Thanks
Here is the code that I believe is causing the issue:
Buffer.java
public byte[] getString() {
int i=getInt();
byte[] foo=new byte[i]; // This is the line causing
the issue
getByte(foo, 0, i);
return foo;
}
public int getInt(){
int foo = getShort();
foo = ((foo<<16)&0xffff0000) | (getShort()&0xffff);
return foo;
}
int getShort() {
int foo = getByte();
foo = ((foo<<8)&0xff00)|(getByte()&0xff);
return foo;
}
public int getByte() {
return (buffer[s++]&0xff);
}
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