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<p class=MsoNormal><span class=apple-style-span><font size=2 color=black
face=Verdana><span style='font-size:10.0pt;font-family:Verdana;color:black'>Hi</span></font></span><span
class=apple-converted-space><font size=2 color=black face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:black'> </span></font></span><font
size=2 color=black face=Verdana><span style='font-size:10.0pt;font-family:Verdana;
color:black'><br>
<span class=apple-style-span>I am writing a</span><span
class=apple-converted-space> </span><span class=apple-style-span><b
style='background-image:initial;background-attachment:initial;background-origin: initial;
background-clip: initial;background-position:initial initial;background-repeat:
initial initial'><span style='background:#FFFF66;font-weight:bold'>drools</span></b></span><span
class=apple-converted-space> </span><span class=apple-style-span>based
app. I am getting this error when I create an instance of KnowledgeBuilder</span><span
class=apple-converted-space> </span><br>
<br>
<span class=apple-style-span>at line,</span><span class=apple-converted-space> </span><br>
<br>
<span class=apple-style-span>KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder();</span><span
class=apple-converted-space> </span><br>
<br>
<br>
<span class=apple-style-span>Here is the error. Can anyone tell what does this
error mean ?</span><span class=apple-converted-space> </span><br>
<br>
<span class=apple-style-span>java.lang.NullPointerException: Parent</span><span
class=apple-converted-space> </span><span class=apple-style-span><b
style='background-image:initial;background-attachment:initial;background-origin: initial;
background-clip: initial;background-position:initial initial;background-repeat:
initial initial'><span style='background:#FFFF66;font-weight:bold'>ClassLoader</span></b></span><span
class=apple-converted-space> </span><span class=apple-style-span>may not
be null</span><span class=apple-converted-space> </span><br>
<span class=apple-style-span> at java.lang.<b style='background-image:
initial;background-attachment:initial;background-origin: initial;background-clip: initial;
background-position:initial initial;background-repeat:initial initial'><span
style='background:#FFFF66;font-weight:bold'>ClassLoader</span></b>.<init>(<b
style='background-image:initial;background-attachment:initial;background-origin: initial;
background-clip: initial;background-position:initial initial;background-repeat:
initial initial'><span style='background:#FFFF66;font-weight:bold'>ClassLoader</span></b>.java:239)</span><span
class=apple-converted-space> </span><br>
<span class=apple-style-span> at java.lang.<b style='background-image:
initial;background-attachment:initial;background-origin: initial;background-clip: initial;
background-position:initial initial;background-repeat:initial initial'><span
style='background:#FFFF66;font-weight:bold'>ClassLoader</span></b>.<init>(<b
style='background-image:initial;background-attachment:initial;background-origin: initial;
background-clip: initial;background-position:initial initial;background-repeat:
initial initial'><span style='background:#FFFF66;font-weight:bold'>ClassLoader</span></b>.java:226)</span><span
class=apple-converted-space> </span><br>
<span class=apple-style-span> at org.<b style='background-image:
initial;background-attachment:initial;background-origin: initial;background-clip: initial;
background-position:initial initial;background-repeat:initial initial'><span
style='background:#FFFF66;font-weight:bold'>drools</span></b>.util.CompositeClassLoader.<init>(CompositeClassLoader.java:38)</span><span
class=apple-converted-space> </span><br>
<span class=apple-style-span> at org.<b style='background-image:
initial;background-attachment:initial;background-origin: initial;background-clip: initial;
background-position:initial initial;background-repeat:initial initial'><span
style='background:#FFFF66;font-weight:bold'>drools</span></b>.util.<b
style='background-image:initial;background-attachment:initial;background-origin: initial;
background-clip: initial;background-position:initial initial;background-repeat:
initial initial'><span style='background:#FFFF66;font-weight:bold'>ClassLoaderUtil</span></b>.getClassLoader(<b
style='background-image:initial;background-attachment:initial;background-origin: initial;
background-clip: initial;background-position:initial initial;background-repeat:
initial initial'><span style='background:#FFFF66;font-weight:bold'>ClassLoaderUtil</span></b>.java:27)</span><span
class=apple-converted-space> </span><br>
<span class=apple-style-span> at org.<b style='background-image:
initial;background-attachment:initial;background-origin: initial;background-clip: initial;
background-position:initial initial;background-repeat:initial initial'><span
style='background:#FFFF66;font-weight:bold'>drools</span></b>.compiler.PackageBuilderConfiguration.setClassLoader(PackageBuilderConfiguration.java:333)</span><span
class=apple-converted-space> </span><br>
<span class=apple-style-span> at org.<b style='background-image:
initial;background-attachment:initial;background-origin: initial;background-clip: initial;
background-position:initial initial;background-repeat:initial initial'><span
style='background:#FFFF66;font-weight:bold'>drools</span></b>.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:165)</span><span
class=apple-converted-space> </span><br>
<span class=apple-style-span> at org.<b style='background-image:
initial;background-attachment:initial;background-origin: initial;background-clip: initial;
background-position:initial initial;background-repeat:initial initial'><span
style='background:#FFFF66;font-weight:bold'>drools</span></b>.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:159)</span><span
class=apple-converted-space> </span><br>
<span class=apple-style-span> at org.<b style='background-image:
initial;background-attachment:initial;background-origin: initial;background-clip: initial;
background-position:initial initial;background-repeat:initial initial'><span
style='background:#FFFF66;font-weight:bold'>drools</span></b>.compiler.PackageBuilder.<init>(PackageBuilder.java:210)</span><span
class=apple-converted-space> </span><br>
<span class=apple-style-span> at org.<b style='background-image:
initial;background-attachment:initial;background-origin: initial;background-clip: initial;
background-position:initial initial;background-repeat:initial initial'><span
style='background:#FFFF66;font-weight:bold'>drools</span></b>.compiler.PackageBuilder.<init>(PackageBuilder.java:143)</span><span
class=apple-converted-space> </span><br>
<span class=apple-style-span> at Org.<b style='background-image:
initial;background-attachment:initial;background-origin: initial;background-clip: initial;
background-position:initial initial;background-repeat:initial initial'><span
style='background:#FFFF66;font-weight:bold'>drools</span></b>.builder.impl.KnowledgeBuilderFactoryServiceImpl.newKnowledgeBuilder(KnowledgeBuilderFactoryS</span><span
class=apple-converted-space> </span><br>
<span class=apple-style-span> at org.<b style='background-image:
initial;background-attachment:initial;background-origin: initial;background-clip: initial;
background-position:initial initial;background-repeat:initial initial'><span
style='background:#FFFF66;font-weight:bold'>drools</span></b>.builder.KnowledgeBuilderFactory.newKnowledgeBuilder(KnowledgeBuilderFactory.java:47)</span><span
class=apple-converted-space> </span><br>
<span class=apple-style-span> at
com.ts.DBconnector.readKnowledgeBase(DBconnector.java:125)</span><span
class=apple-converted-space> </span><o:p></o:p></span></span></span></font></p>
<p class=MsoNormal><span class=apple-converted-space><font size=2 color=black
face=Verdana><span style='font-size:10.0pt;font-family:Verdana;color:black'><o:p> </o:p></span></font></span></p>
<p class=MsoNormal><span class=apple-converted-space><font size=2 color=black
face=Verdana><span style='font-size:10.0pt;font-family:Verdana;color:black'>I
also tried adding this <o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=apple-converted-space><font size=2 color=black
face=Verdana><span style='font-size:10.0pt;font-family:Verdana;color:black'><o:p> </o:p></span></font></span></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=black
face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New";
color:black'> Thread.<i><span style='font-style:italic'>currentThread</span></i>().setContextClassLoader(
</span></font><b><font size=2 color="#7f0055" face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:#7F0055;font-weight:
bold'>this</span></font></b><font size=2 color=black face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:black'>.getClass().getClassLoader()
);</span></font><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'><o:p></o:p></span></font></p>
<p class=MsoNormal><span class=apple-converted-space><font size=2 color=black
face=Verdana><span style='font-size:10.0pt;font-family:Verdana;color:black'><o:p> </o:p></span></font></span></p>
<p class=MsoNormal><span class=apple-converted-space><font size=2 color=black
face=Verdana><span style='font-size:10.0pt;font-family:Verdana;color:black'>But
am still getting the same error … please help !<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=apple-converted-space><font size=2 color=black
face=Verdana><span style='font-size:10.0pt;font-family:Verdana;color:black'><o:p> </o:p></span></font></span></p>
<p class=MsoNormal><span class=apple-converted-space><font size=2 color=black
face=Verdana><span style='font-size:10.0pt;font-family:Verdana;color:black'>-abhay</span></font></span><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
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