Hi, I am facing the problem below. Could you plz help me out in this matter?


java -jar AHISInstaller.jar
- ERROR -
java.lang.NullPointerException
java.lang.NullPointerException
at java.util.Hashtable.put(Unknown Source)
at java.util.Properties.setProperty(Unknown Source)
at com.izforge.izpack.installer.AutomatedInstallData.setVariable(AutomatedInstallData.java:172)
at com.izforge.izpack.installer.AutomatedInstallData.setIP(AutomatedInstallData.java:214)
at com.izforge.izpack.installer.InstallerBase.loadInstallData(InstallerBase.java:217)
at com.izforge.izpack.installer.GUIInstaller.<init>(GUIInstaller.java:110)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at com.izforge.izpack.installer.Installer.main(Installer.java:62)

We probably need some more information here if we are going to help you.

At the very least it would be helpful to know your Java and JVM version. Run "java -version" and post the output.

The error message just means that AHISInstaller.jar is trying to put a null (or "unknown") value into a property map.
Possibly this could mean that you need to pass some other options to AHSIInstaller.jar.

A quick search on Google doesn't reveal anything about this file; if it is a program you have bought or downloaded then you could contact the authors of the program for help.

The fact that it's in a method called "setIP" could also point to a networking issue. Can you connect to the Internet from that computer? If you run "/sbin/ifconfig eth0 | grep inet" (the | symbol is a pipe character) then you should get your network address, which is usually a number something like 192.168.1.1. If you get an error like "device not found" instead then I would start by looking at your network setup.

Another thing you could try is running a simple "hello, world" Java program (http://www.javacoffeebreak.com/java101/java101.html) and seeing if you get the same error; if so then it is likely to be a problem with your JVM (Java Virtual Machine); you could try re-installing Java.

Hope that helps,

—Robert J Lee

Thanks a lot for your reply. I have pasted the version of java below.

[root@localhost ~]# java -version
java version "1.4.2_15"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_15-b02)
Java HotSpot(TM) Client VM (build 1.4.2_15-b02, mixed mode)


There are no problems with the network at all. I am checked the network connection by the following command.

[root@localhost Desktop]# ping www.google.com
PING www.l.google.com (72.14.215.99) 56(84) bytes of data.
64 bytes from hu-in-f99.google.com (72.14.215.99): icmp_seq=0 ttl=239 time=365 ms
64 bytes from hu-in-f99.google.com (72.14.215.99): icmp_seq=1 ttl=239 time=361 ms
64 bytes from hu-in-f99.google.com (72.14.215.99): icmp_seq=2 ttl=239 time=404 ms
64 bytes from hu-in-f99.google.com (72.14.215.99): icmp_seq=3 ttl=239 time=349 ms

All I have with me is the AHISInstaller jar file with me which I have downloaded. The source codes are not with us. Should I go back to them? Do you think it is a coding problem? Would be really helpful if you could advice on this.