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PermalinkDec 04, 2016 I tried to install extracted jpcap from jpcap-0.7-1.i386.rpm and capture packets, but I'm getting this error: Exception in thread 'main' java.lang.UnsatisfiedLinkError: no Stack Overflow new Try Stack Overflow for Business. For those who are looking for java.lang.UnsatisfiedLinkError: no pdfjava in java.library.path. I was facing same exception; I tried everything and important things to make it work are: Correct version of pdf lib.jar ( In my case it was wrong version jar kept in server runtime ).
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Sign up$Id: FAQ,v 1.13 2004/04/06 22:14:38 pcharles Exp $ |
jpcap FAQ |
General |
Q. Can I use JDK1.3, J2SE 1.4 or J2SE 1.5? |
A. Yes. Jpcap has been tested with these VM's and works fine. |
For backward compatibility, though, it doesn't yet utilize any |
VM features specific to J2SE 1.3 or later. |
Q. I'm using JDK1.2 and the performance is terrible. |
A. Although the project compiles and runs under JDK1.2, JDK1.3 or better |
is highly recommended. In general, the performance of the 1.3 VM |
is superior to 1.2. The difference is especially noticeable in jpcap |
when using the graphical component of |
net.sourceforge.jpcap.client.CaptureTool to visualize network traffic. |
Q. Can I use JDK1.1? |
A. No. jpcap uses the new JNI (Java Native Interface) and |
new collection classes which are not available in or compatible |
with JDK1.1. You need to use J2SE, JDK1.2 or later. |
Q. I'm trying to create multiple PacketCapture instances, and |
it isn't working properly. |
A. Upgrade to jpcap v0.01.15 or later. Multiple simultaneous |
packet capture instances within the same Java VM weren't supported |
in earlier versions of jpcap. |
Q. I'm trying to run jpcap, or an application written to use the packet |
capture library, and I'm getting an error similar to: |
loading native library jpcap. Exception in thread 'main' |
java.lang.UnsatisfiedLinkError: no jpcap in java.library.path |
A. This means that the jpcap shared library is not in your path. |
On Windows, this means that jpcap.dll is not one of the directories |
specified by the PATH environment variable. On Unix, this means that |
the file libjpcap.so is not in one of the directories specified by your |
LD_LIBRARY_PATH. On Mac OS X, this means that the file libjpcap.jnilib |
is not in one of the directories specified by your |
DYLD_LIBRARY_PATH. |
Linux |
Q. When trying to install the jpcap rpm, I get the message: |
error: Failed dependencies: |
libstdc++-libc6.2-2.so.3 is needed by jpcap-0.01.16-1 |
A. Install the compat-stdc++ rpm for backward compatibility. |
e.g. 'yum install compat-libstdc++' |
Q. When trying to run jpcap, I get the following error: |
/usr/java/j2sdkx.y/bin/i386/native_threads/java: |
error while loading shared libraries: libstdc++-libc6.1-1.so.2: |
cannot open shared object file: No such file or directory |
A. Install the libstdc++ backward compatibility rpm. |
e.g. 'yum install compat-libstdc++' |
Q. I'm calling PacketCapture.getNetwork() and .getNetmask(), and |
the methods always return zero or garbage. |
A. These functions return random values which change with every |
invocation on some older versions of libpcap, notably 0.4-16 |
included with the tool ethereal. |
Upgrading to libpcap v0.6.2 or later is recommended. |
Q. I'm trying to use jpcap on my Alpha AXP machine, but I can't |
capture any packets. |
A. There are problems with older versions of libpcap on Alpha. |
On 2.2.5-22 kernel Alpha machine, libpcap-0.4-19 and |
libpcap-0.4-29 distributions packaged by redhat do not work. |
All pcap functions return normally, but after entering |
pcap_loop(), no packets are ever captured and the handler |
never called back. |
On alpha, upgrade to the latest version of libpcap. |
libpcap-0.6.2-3 (included in RawHide for Alpha distro) |
is recommended. Try rpmfind.org to locate the latest for |
your distribution. |
Q. When trying to run jpcap, I get the following error: |
'too many registers needed to evaluate expression'. |
A. This is a bug in libpcap. Upgrade to a version later than |
0.7, or if you are compiling your own libpcap, look for |
Ken Key's patch to gencode.c which fixes the problem. |
Q. How do I build jpcap on my Linux box? |
A. See the document 'docs/BUILD.unix' in the source distribution. |
Mac OS X |
Q. How do I build jpcap on my Mac OS X? |
A. See the document 'docs/BUILD.osx'. |
Q. When I run the jpcap sample client, I can capture packets, but when I |
try to manipulate the vectors in visualization window, it freezes. |
A. This appears to be a bug specifically in the Java implementation for |
Mac OS X. No known workarounds exist, but submissions (perhaps from |
someone more intimiately familiar with Mac OS X Java internals?) would |
be very welcome.:/ |
Q. I can't get jpcap to build from source on my Mac. |
A. Upgrade to jpcap v0.01.14 or later. The makefiles in earlier versions |
of jpcap didn't support the Mac OS X platform without modification. |
If you are already using jpcap v0.01.14 and still having problems, |
try looking at the document 'docs/BUILD.osx'. |
Windows |
Q. How do I build jpcap on my Windows box? |
A. See the document 'docs/BUILD.windows'. |
Q. When I run the jpcap.bat file on Windows, I can capture and display |
packets, but the console text is cluttered by weird characters. |
These strange characters are really scaring me; they look like this: |
[<-[1;33mTCPPacket<-[0m: |
A. These strange characters are ansi escape sequences which, on most |
platforms, cause the text (in this case 'TCPPacket') to appear |
in different colors. These ansii escape sequences don't work in DOS. |
They can be disabled in properties/tool.properties by changing |
net.sourceforge.jpcap.console.color=false |