Null Pointer Exception - PolicyRuntime.java

Question

hi..,
Im developing a Java Web Service Client using jaxrpc in WebSphere 5.1 . But im gettin an exception like this:
java.lang.NullPointerException
     at com.trend.iwss.jscan.appscan.runtime.PolicyRuntime.getB64StrProp(PolicyRuntime.java:188)
     at com.trend.iwss.jscan.appscan.runtime.PolicyRuntime.<init>(PolicyRuntime.java:91)
     at com.trend.iwss.jscan.appscan.runtime.MiscPolicyRuntime.<init>(MiscPolicyRuntime.java:132)
     at com.trend.iwss.jscan.appscan.runtime.MiscPolicyRuntime$Factory.make(MiscPolicyRuntime.java:254)
     at com.trend.iwss.jscan.appscan.runtime.PolicyRuntime.accessInstance(PolicyRuntime.java:225)
     at com.trend.iwss.jscan.appscan.runtime.PolicyRuntime.preFilter(PolicyRuntime.java:127)
     at com.trend.iwss.jscan.appscan.runtime.MiscPolicyRuntime.preFilter(MiscPolicyRuntime.java:142)
     at javax.xml.rpc.FactoryFinder.find(FactoryFinder.java:141)
     at javax.xml.rpc.ServiceFactory.newInstance(ServiceFactory.java:63)
     at myPack.HelloClient.hello(HelloClient.java:45)
     at myPack.HelloClient.main(HelloClient.java:65)
It occurs where i hav created the object of any class in the api.I checked the compatibility of the jar files i included. I tried the same with Axis
API also. same exception is obtained.Can anyone help me ..
Thanks in advance,
Arun

Answer 1

Hello,
Java Server Page is a technology that we use to
generate HTML dynamically and you use scriptlets to
perform this.
that's why you are not allowed to use awt or swing
packages.
all graphical components have to be an HTML component
(including applets).
Najib.Hi,
I know you are supposed to generate an HTML file, and I'm not creating a JFrame to display it. Let me explain how our application works: when the user presses a button in our page, we have to create a .pdf file and generate a page with a link to it so the user can download it.
This .pdf file has some charts (the charts and pdf are created with Sitraka's JClass Chart and PageLayout), and in order to embedd the chart in the .pdf file we need to put it first in a JFrame.
The code snippet is:
JFrame frame = new JFrame();
frame.getContentPane().add(chart);
frame.addNotify();
Image img = chart.snapshot();
frame.removeNotify();
frame.removeAll();
This works most of the time, but in this specific machine sometimes the instantiation of the JFrame fails with the error I posted before.
Hope I have made things more clear.
Wesley