Thrameos
commented
4 years ago I haven't done much with that platform but lets first go through the basics.
1) Write a simple hello world just starts JPype by itself without anything else.
import jpype
print (jpype.getDefaultJVMPath())
jpype.startJVM()
print(jpype.java.lang.System.getProperty('java.class.path'))2) Lets assume it crashes here. Okay the problem is with the shared library. So we need to verify that the shared library and the Python have the same architecture (both 64 bit). Assuming that is correct...
3) Next we need to look for a dependency problem. Java has to find all of its required shared libraries when it loads. If something is missing then the JVM will fail to load. On some systems like Window 16 server that means adding the bin directory to the path. Use a library tool to verify that all libraries required are able to be found.
4) If JPype does load by itself, the problem then the issue would have to be loading up a resource for JVM loading a native library. If this is the case then we would have to look at what resource that are loaded with that native library.
This is still pretty far from specific. 1) What JVM vendor and version? 2) Does JPype pass its self test? 3) Can you produce a backtrace from the core file. (Please note that the JVM will scramble the core file on some systems. On those systems it is necessary to run the debugger rather than analyzing the core). 4) What do you mean by "initiate a connection"? Is that after the JVM is started or when the JDBC driver is loaded? 5) Is there a mismatch in shared library architecture between the JVM, Python and the JDBC library? 6) If JPype does load the JVM what happens if you call forName on the JDBC driver? 7) What version of JPype is being run?
Devender2806
Dear Team,
We are attempting to install python 3.6 64 bit on IBM I server (PACE,AIX) so that we can connect to Oracle database. I started to work with JDBC thin driver concept first hence downloaded and installed jaydebeapi and JPype1 using the pip3 install command. The libraries installed fine, but when i initiate a connection i get core dump. I tried reading the core file with java tools and all it tells me is no JRE.
I can see java and javac executable files in the one of the directories and when i type java or javac it displays list of options. I also tried giving the path of libjvm.so file but doesn't help. I setup the JAVA_HOME and LIBPATH and PATH variables accordingly but i cannot get past the core dump. We have almost 7 JVMs running on the I series box currently.