[rules-users] Declared Types with large number of fields
Hi.
I am using declared types in .drl rule rule. When I kept the number of
fields in a declared type low, drools works fine. When I am increasing the
number of fields in a declared type to 300 or even more, drools raising an
exception.
Particularly, it is giving this.
ava.lang.ClassFormatError: Too many arguments in method signature in class
file com/sample/Project
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at
org.drools.rule.JavaDialectRuntimeData$PackageClassLoader.fastFindClass(JavaDialectRuntimeData.java:615)
at
org.drools.util.CompositeClassLoader$CachingLoader.load(CompositeClassLoader.java:254)
at
org.drools.util.CompositeClassLoader$CachingLoader.load(CompositeClassLoader.java:237)
at
org.drools.util.CompositeClassLoader.loadClass(CompositeClassLoader.java:88)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at
org.drools.base.ClassTypeResolver.resolveType(ClassTypeResolver.java:155)
at
org.drools.compiler.PackageBuilder.processTypeDeclarations(PackageBuilder.java:2049)
at
org.drools.compiler.PackageBuilder.mergePackage(PackageBuilder.java:1218)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:829)
at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:467)
at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:673)
at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:45)
at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:34)
at com.sample.DroolsTest.readKnowledgeBase(DroolsTest.java:67)
at com.sample.DroolsTest.main(DroolsTest.java:24)
I suspect, it is something to do with creating class, constructor with so
many arguments at run time. I am looking for a solution, something like
declared types, or a workaround. The purpose for which I am using Drools
limits to use the traditional Java classes, or defining a Java class.
Also, is there any way, to perform calculations, or value propagations.
That, Drools could assume some value to a variable given a certain
constraint on it.
For example, x > 6 && x < 9, Drools could assume x as 7 or 8 and fire
rules?
Thank you.
Phani
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