JESS: clarification on defclass & deftemplate constructs

[Subrahmanyam BVSS]

HI All,   I want to give the tag name in defclass construct in rule file dynamically I defined the names to be used for each kind of facts in a Constatnts class (RuleEngineConstants) - all as public static final strings.   So instead of following: (defclass alertdefinition com.foo.MyClass)   I want to use it like (defclass (get-member RuleEngineConstants “ALERT_DEF_NAME”) com.foo.MyClass)   Also in the futher deftemplates like following:   (deftemplate PassThrough_AlertDefDetails     "Template for pass through alert definition details."     (slot alertdefinition (type OBJECT)))   I want to use it like (deftemplate PassThrough_AlertDefDetails     "Template for pass through alert definition details."     (slot (get-member RuleEngineConstants "ALERT_DEFINITION_FACT") (type OBJECT)))   I have all the required imports in the rule file. I am getting an error as bad slot name. Is there any way to give the tag name in defclass & Deftemplate constructs dynamically in the rule file only (Not from java)?   Following is the error stack trace for your reference:   Jess reported an error in routine Jesp.parseDeftemplate.   Message: Bad slot name .   Program text: ( deftemplate PassThrough_AlertDefDetails "Template for pass through alert definition details." ( slot (  at line 307.       at jess.Jesp.parseError(Jesp.java:1622)       at jess.Jesp.parseDeftemplate(Jesp.java:791)       at jess.Jesp.parseSexp(Jesp.java:158)       at jess.Jesp.parse(Jesp.java:69)       at jess.Rete.executeCommand(Rete.java:1413)       at jess.Rete.executeCommand(Rete.java:1397)       at com.uprr.app.aaa.business.rule.engine.PassThroughPatternRuleTest.testLoadRules(PassThroughPatternRuleTest.java:112)       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)       at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)       at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)       at java.lang.reflect.Method.invoke(Unknown Source)       at junit.framework.TestCase.runTest(TestCase.java:154)       at junit.framework.TestCase.runBare(TestCase.java:127)       at junit.framework.TestResult$1.protect(TestResult.java:106)       at junit.framework.TestResult.runProtected(TestResult.java:124)       at junit.framework.TestResult.run(TestResult.java:109)       at junit.framework.TestCase.run(TestCase.java:118)       at junit.framework.TestSuite.runTest(TestSuite.java:208)       at junit.framework.TestSuite.run(TestSuite.java:203)       at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:478)       at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:344)       at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)   Thanks in advance.   Subrahmanyam