Michael,<br><br> Can you show us your rule(s) please? it is raising the NPE when trying to get the list of variables you use in the consequence... as soon as we determine what the real problem is, I can fix the error message...
<br><br> []s<br> Edson<br><br><div><span class="gmail_quote">2007/10/30, Michael Fuller <<a href="mailto:mfuller@ihets.org">mfuller@ihets.org</a>>:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">I have the following code: (note String[] ruleFiles contains
only one string)</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">public class Engine {</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> private static RuleBase ruleBase;</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> public void start(String[] ruleFiles)
throws Exception {</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
PackageBuilderConfiguration cfg = new PackageBuilderConfiguration();</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
JavaDialectConfiguration javaConf = (JavaDialectConfiguration)
cfg.getDialectConfiguration("java");</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
javaConf.setCompiler(JavaDialectConfiguration.ECLIPSE);</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> PackageBuilder
builder = new PackageBuilder(cfg);</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> for (String file
: ruleFiles) {</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
builder.addPackageFromDrl(new
InputStreamReader(ClassLoader.getSystemResourceAsStream(file)));</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> }</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> Package pkg =
builder.getPackage();</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
PackageBuilderErrors errors = builder.getErrors();</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> if
(errors.getErrors().length != 0) {</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
// do something</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> }</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
RuleBaseConfiguration conf = new RuleBaseConfiguration();</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
conf.setAssertBehaviour(RuleBaseConfiguration.AssertBehaviour.EQUALITY);</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> ruleBase =
RuleBaseFactory.newRuleBase();</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
ruleBase.addPackage(pkg);</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> ruleBase.newStatefulSession(false);</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> }</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">}</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">At the builder.addPackageFromDrl(new
InputStreamReader(ClassLoader.getSystemResourceAsStream(file))); line I'm
getting the following exception:</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">java.lang.NullPointerException</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
at org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build(JavaConsequenceBuilder.java:54)</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:67)</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:446)</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:304)</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:167)</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
at myPackage.rivoli.service.rules.Engine.start(Engine.java:33)</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
at myPackage.rivoli.rules.LeaderKingAndHeirTest.setUp(LeaderKingAndHeirTest.java:26)</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:40)</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:90)</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">I am using Drools 4.0.3</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">I have the following jars in my class path:</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">antlr-runtime-3.0.jar </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">core-3.2.3.v_686_R32x.jar</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">drools-compiler-4.0.3.jar</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">drools-core-4.0.3.jar</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">mvel14-1.2.10.jar</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">Any ideas would be helpful. Thanks.</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">Michael Fuller</span></font></p>
<p><font face="Times New Roman" size="3"><span style="font-size: 12pt;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">"In theory there is no difference between theory and
practice. But, in practice, there is." - Jan L.A. van de Snepscheut</span></font></p>
<p><font face="Times New Roman" size="3"><span style="font-size: 12pt;"> </span></font></p>
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https://lists.jboss.org/mailman/listinfo/rules-users</a><br><br></blockquote></div><br><br clear="all"><br>-- <br> Edson Tirelli<br> Software Engineer - JBoss Rules Core Developer<br> Office: +55 11 3529-6000<br> Mobile: +55 11 9287-5646
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