NullPointerException with LeftTupleIndexHashTable.remove()
by Mark Proctor
I have managed to reduce down the project from mxv into a single unit test that can be added to Misc2Test. I turned tracing on, and it fails while evaluating R1:
2014-02-25 05:00:16,192 [main] TRACE Rule[name=R1] segments=2 TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,192 [main] TRACE 11 [JoinNode(5) - [ClassObjectType class=org.drools.compiler.integrationtests.Misc2Test$Foo2]] TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,192 [main] TRACE Skip Segment 0
2014-02-25 05:00:16,192 [main] TRACE Segment 1
2014-02-25 05:00:16,192 [main] TRACE 11 [JoinNode(7) - [ClassObjectType class=org.drools.compiler.Person]] TupleSets[insertSize=0, deleteSize=0, updateSize=1]
2014-02-25 05:00:16,193 [main] TRACE rightTuples TupleSets[insertSize=1, deleteSize=0, updateSize=0]
I’ve provided the new test and the full trace log below.
The problem is the node sharing of Foo2. R1 thinks it’s propagating an update, when it never passed R1’s Foo2 before, so it should propagate as an update for R2 but an insert for R1. I suspect the problem is related to the SegmentPropagator when it is updated after moving from the first shared segment, to the two child segments.
Please try to avoid submitting project jars. It takes a lot more time for us to setup and work with, which will delay our time in getting back to you. Ideally create a reduced single test method, as per blow, that is self contained, and submit it with pull request and associated JIRA. see:
http://docs.jboss.org/drools/release/5.6.0.Final/droolsjbpm-introduction-...
@Test
public void testSharedNotWithLeftUpdateAndRightInsert() throws Exception {
String str =
"import " + Foo.class.getCanonicalName() + ";\n" +
"import " + Foo2.class.getCanonicalName() + ";\n" +
"import " + Person.class.getCanonicalName() + ";\n" +
"rule R1 when\n" +
" f1 : Foo( )\n" +
" Foo2( )\n" +
" Person( age == f1.x )\n" +
"then\n" +
"end\n" +
"rule R2 when\n" +
" Foo( )\n" +
" f2 : Foo2( )\n" +
" not Person()\n" +
"then\n" +
" modify( f2 ) { x = 3};\n" +
" insert( new Person() );\n" +
"end\n";
KnowledgeBase kbase = loadKnowledgeBaseFromString(str);
StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
Foo f1 = new Foo();
Foo2 f2 = new Foo2();
ksession.insert( f1 );
ksession.insert( f2 );
assertEquals(2, ksession.fireAllRules() );
assertEquals( 3, f2.getX() );
}
For those interested, here is the full trace output once trace is turned on:
2014-02-25 05:13:33,610 [main] DEBUG Starting Engine in PHREAK mode
2014-02-25 05:13:33,715 [main] TRACE Adding Rule R1
2014-02-25 05:13:33,720 [main] TRACE Adding Rule R2
2014-02-25 05:13:33,809 [main] TRACE Insert [fact 0:1:1668059028:1668059028:1:DEFAULT:NON_TRAIT:org.drools.compiler.integrationtests.Misc2Test$Foo@636c8f94]
2014-02-25 05:13:33,822 [main] TRACE LinkNode notify=false nmask=1 smask=1 spos=0 rules=
2014-02-25 05:13:33,823 [main] TRACE LinkSegment smask=2 rmask=2 name=R2
2014-02-25 05:13:33,831 [main] TRACE LinkNode notify=true nmask=1 smask=1 spos=0 rules=[RuleMem R1], [RuleMem R2]
2014-02-25 05:13:33,832 [main] TRACE Insert [fact 0:2:588638666:588638666:2:DEFAULT:NON_TRAIT:org.drools.compiler.integrationtests.Misc2Test$Foo2@2315e9ca]
2014-02-25 05:13:33,833 [main] TRACE BetaNode insert=1 stagedInsertWasEmpty=true
2014-02-25 05:13:33,833 [main] TRACE LinkNode notify=true nmask=2 smask=3 spos=0 rules=[RuleMem R1], [RuleMem R2]
2014-02-25 05:13:33,833 [main] TRACE LinkSegment smask=1 rmask=1 name=R1
2014-02-25 05:13:33,834 [main] TRACE LinkSegment smask=1 rmask=3 name=R2
2014-02-25 05:13:33,834 [main] TRACE LinkRule name=R2
2014-02-25 05:13:33,855 [main] TRACE Queue RuleAgendaItem [Activation rule=R2, act#=0, salience=0, tuple=null]
2014-02-25 05:13:33,856 [main] TRACE Queue Added 1 [Activation rule=R2, act#=0, salience=0, tuple=null]
2014-02-25 05:13:33,856 [main] TRACE Rule[name=R2] segments=2 TupleSets[insertSize=1, deleteSize=0, updateSize=0]
2014-02-25 05:13:33,856 [main] TRACE 1 [JoinNode(5) - [ClassObjectType class=org.drools.compiler.integrationtests.Misc2Test$Foo2]] TupleSets[insertSize=1, deleteSize=0, updateSize=0]
2014-02-25 05:13:33,857 [main] TRACE Segment 0
2014-02-25 05:13:33,857 [main] TRACE 1 [JoinNode(5) - [ClassObjectType class=org.drools.compiler.integrationtests.Misc2Test$Foo2]] TupleSets[insertSize=1, deleteSize=0, updateSize=0]
2014-02-25 05:13:33,865 [main] TRACE rightTuples TupleSets[insertSize=1, deleteSize=0, updateSize=0]
2014-02-25 05:13:33,867 [main] TRACE Segment 1
2014-02-25 05:13:33,867 [main] TRACE 2 [NotNode(9) - [ClassObjectType class=org.drools.compiler.Person]] TupleSets[insertSize=1, deleteSize=0, updateSize=0]
2014-02-25 05:13:33,867 [main] TRACE Segment 1
2014-02-25 05:13:33,868 [main] TRACE 2 [NotNode(9) - [ClassObjectType class=org.drools.compiler.Person]] TupleSets[insertSize=1, deleteSize=0, updateSize=0]
2014-02-25 05:13:33,868 [main] TRACE rightTuples TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:13:33,870 [main] TRACE 3 [RuleTerminalNode(10): rule=R2] TupleSets[insertSize=1, deleteSize=0, updateSize=0]
2014-02-25 05:13:33,871 [main] TRACE Segment 1
2014-02-25 05:13:33,871 [main] TRACE 3 [RuleTerminalNode(10): rule=R2] TupleSets[insertSize=1, deleteSize=0, updateSize=0]
2014-02-25 05:13:33,871 [main] TRACE Fire "R2"
[[ R2 active=false ] [ null
[fact 0:2:588638666:588638666:2:DEFAULT:NON_TRAIT:org.drools.compiler.integrationtests.Misc2Test$Foo2@2315e9ca]
[fact 0:1:1668059028:1668059028:1:DEFAULT:NON_TRAIT:org.drools.compiler.integrationtests.Misc2Test$Foo@636c8f94] ] ]
2014-02-25 05:13:33,877 [main] TRACE Update [fact 0:2:588638666:588638666:3:DEFAULT:NON_TRAIT:org.drools.compiler.integrationtests.Misc2Test$Foo2@2315e9ca]
2014-02-25 05:13:33,879 [main] TRACE LinkSegment smask=1 rmask=1 name=R1
2014-02-25 05:13:33,879 [main] TRACE LinkSegment smask=1 rmask=3 name=R2
2014-02-25 05:13:33,879 [main] TRACE LinkRule name=R2
2014-02-25 05:13:33,880 [main] TRACE Insert [fact 0:3:1618732380:-62068830:4:DEFAULT:LEGACY_TRAITABLE:[Person name='null age='0' likes='null']]
2014-02-25 05:13:33,880 [main] TRACE BetaNode insert=1 stagedInsertWasEmpty=true
2014-02-25 05:13:33,880 [main] TRACE LinkNode notify=true nmask=1 smask=1 spos=1 rules=[RuleMem R1]
2014-02-25 05:13:33,880 [main] TRACE LinkSegment smask=2 rmask=3 name=R1
2014-02-25 05:13:33,881 [main] TRACE LinkRule name=R1
2014-02-25 05:13:33,881 [main] TRACE Queue RuleAgendaItem [Activation rule=R1, act#=2, salience=0, tuple=null]
2014-02-25 05:13:33,881 [main] TRACE Queue Added 1 [Activation rule=R1, act#=2, salience=0, tuple=null]
2014-02-25 05:13:33,881 [main] TRACE LinkNode notify=true nmask=1 smask=1 spos=1 rules=[RuleMem R2]
2014-02-25 05:13:33,882 [main] TRACE LinkSegment smask=2 rmask=3 name=R2
2014-02-25 05:13:33,882 [main] TRACE LinkRule name=R2
2014-02-25 05:13:33,882 [main] TRACE Rule[name=R1] segments=2 TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:13:33,882 [main] TRACE 4 [JoinNode(5) - [ClassObjectType class=org.drools.compiler.integrationtests.Misc2Test$Foo2]] TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:13:33,883 [main] TRACE Segment 0
2014-02-25 05:13:33,883 [main] TRACE 4 [JoinNode(5) - [ClassObjectType class=org.drools.compiler.integrationtests.Misc2Test$Foo2]] TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:13:33,884 [main] TRACE rightTuples TupleSets[insertSize=0, deleteSize=0, updateSize=1]
2014-02-25 05:13:33,884 [main] TRACE Segment 1
2014-02-25 05:13:33,884 [main] TRACE 5 [JoinNode(7) - [ClassObjectType class=org.drools.compiler.Person]] TupleSets[insertSize=0, deleteSize=0, updateSize=1]
2014-02-25 05:13:33,884 [main] TRACE Segment 1
2014-02-25 05:13:33,885 [main] TRACE 5 [JoinNode(7) - [ClassObjectType class=org.drools.compiler.Person]] TupleSets[insertSize=0, deleteSize=0, updateSize=1]
2014-02-25 05:13:33,885 [main] TRACE rightTuples TupleSets[insertSize=1, deleteSize=0, updateSize=0]
java.lang.NullPointerException
at org.drools.core.util.index.LeftTupleIndexHashTable.remove(LeftTupleIndexHashTable.java:386)
at org.drools.core.phreak.RuleNetworkEvaluator.doUpdatesReorderLeftMemory(RuleNetworkEvaluator.java:799)
10 years, 9 months
Rule Engine Detailed Trace Mode
by Mark Proctor
For those that don’t know, the new algorithm supports a detailed trace mode. Create a logback.xml and set the level to trace.
<logger name="org.drools" level="trace"/>
You’ll then get outputs like the following, which shows you what rules fired and when, and with what amounts of data for each node. It also shows you when rules are linked and unlinked.
2014-02-25 05:00:16,023 [main] DEBUG Starting Engine in PHREAK mode
2014-02-25 05:00:16,084 [main] TRACE Adding Rule R1
2014-02-25 05:00:16,088 [main] TRACE Adding Rule R2
2014-02-25 05:00:16,134 [main] TRACE Insert [fact 0:1:1708041420:1708041420:1:DEFAULT:NON_TRAIT:org.drools.compiler.integrationtests.Misc2Test$Foo@65cea4cc]
2014-02-25 05:00:16,142 [main] TRACE LinkNode notify=false nmask=1 smask=1 spos=0 rules=
2014-02-25 05:00:16,142 [main] TRACE LinkSegment smask=2 rmask=2 name=R2
2014-02-25 05:00:16,146 [main] TRACE LinkNode notify=true nmask=1 smask=1 spos=0 rules=[RuleMem R1], [RuleMem R2]
2014-02-25 05:00:16,147 [main] TRACE Insert [fact 0:2:281271144:281271144:2:DEFAULT:NON_TRAIT:org.drools.compiler.integrationtests.Misc2Test$Foo2@10c3db68]
2014-02-25 05:00:16,148 [main] TRACE BetaNode insert=1 stagedInsertWasEmpty=true
2014-02-25 05:00:16,148 [main] TRACE LinkNode notify=true nmask=2 smask=3 spos=0 rules=[RuleMem R1], [RuleMem R2]
2014-02-25 05:00:16,148 [main] TRACE LinkSegment smask=1 rmask=1 name=R1
2014-02-25 05:00:16,149 [main] TRACE LinkSegment smask=1 rmask=3 name=R2
2014-02-25 05:00:16,149 [main] TRACE LinkRule name=R2
2014-02-25 05:00:16,161 [main] TRACE Queue RuleAgendaItem [Activation rule=R2, act#=0, salience=0, tuple=null]
2014-02-25 05:00:16,161 [main] TRACE Queue Added 1 [Activation rule=R2, act#=0, salience=0, tuple=null]
2014-02-25 05:00:16,161 [main] TRACE Added R2 to eager evaluation list.
2014-02-25 05:00:16,162 [main] TRACE Rule[name=R2] segments=2 TupleSets[insertSize=1, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,162 [main] TRACE 1 [JoinNode(5) - [ClassObjectType class=org.drools.compiler.integrationtests.Misc2Test$Foo2]] TupleSets[insertSize=1, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,163 [main] TRACE Segment 0
2014-02-25 05:00:16,163 [main] TRACE 1 [JoinNode(5) - [ClassObjectType class=org.drools.compiler.integrationtests.Misc2Test$Foo2]] TupleSets[insertSize=1, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,167 [main] TRACE rightTuples TupleSets[insertSize=1, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,168 [main] TRACE Segment 1
2014-02-25 05:00:16,168 [main] TRACE 2 [NotNode(9) - [ClassObjectType class=org.drools.compiler.Person]] TupleSets[insertSize=1, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,169 [main] TRACE Segment 1
2014-02-25 05:00:16,169 [main] TRACE 2 [NotNode(9) - [ClassObjectType class=org.drools.compiler.Person]] TupleSets[insertSize=1, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,169 [main] TRACE rightTuples TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,171 [main] TRACE 3 [RuleTerminalNode(10): rule=R2] TupleSets[insertSize=1, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,171 [main] TRACE Segment 1
2014-02-25 05:00:16,171 [main] TRACE 3 [RuleTerminalNode(10): rule=R2] TupleSets[insertSize=1, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,172 [main] TRACE Fire "R2"
[[ R2 active=false ] [ null
[fact 0:2:281271144:281271144:2:DEFAULT:NON_TRAIT:org.drools.compiler.integrationtests.Misc2Test$Foo2@10c3db68]
[fact 0:1:1708041420:1708041420:1:DEFAULT:NON_TRAIT:org.drools.compiler.integrationtests.Misc2Test$Foo@65cea4cc] ] ]
2014-02-25 05:00:16,177 [main] TRACE Update [fact 0:2:281271144:281271144:3:DEFAULT:NON_TRAIT:org.drools.compiler.integrationtests.Misc2Test$Foo2@10c3db68]
2014-02-25 05:00:16,178 [main] TRACE LinkSegment smask=1 rmask=1 name=R1
2014-02-25 05:00:16,178 [main] TRACE LinkSegment smask=1 rmask=3 name=R2
2014-02-25 05:00:16,178 [main] TRACE LinkRule name=R2
2014-02-25 05:00:16,178 [main] TRACE Added R2 to eager evaluation list.
2014-02-25 05:00:16,179 [main] TRACE Insert [fact 0:3:1226345699:-62068830:4:DEFAULT:LEGACY_TRAITABLE:[Person name='null age='0' likes='null']]
2014-02-25 05:00:16,179 [main] TRACE BetaNode insert=1 stagedInsertWasEmpty=true
2014-02-25 05:00:16,179 [main] TRACE LinkNode notify=true nmask=1 smask=1 spos=1 rules=[RuleMem R1]
2014-02-25 05:00:16,180 [main] TRACE LinkSegment smask=2 rmask=3 name=R1
2014-02-25 05:00:16,180 [main] TRACE LinkRule name=R1
2014-02-25 05:00:16,180 [main] TRACE Queue RuleAgendaItem [Activation rule=R1, act#=2, salience=0, tuple=null]
2014-02-25 05:00:16,180 [main] TRACE Queue Added 1 [Activation rule=R1, act#=2, salience=0, tuple=null]
2014-02-25 05:00:16,181 [main] TRACE LinkNode notify=true nmask=1 smask=1 spos=1 rules=[RuleMem R2]
2014-02-25 05:00:16,181 [main] TRACE LinkSegment smask=2 rmask=3 name=R2
2014-02-25 05:00:16,181 [main] TRACE LinkRule name=R2
2014-02-25 05:00:16,181 [main] TRACE Added R2 to eager evaluation list.
2014-02-25 05:00:16,181 [main] TRACE Rule[name=R2] segments=2 TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,182 [main] TRACE 4 [JoinNode(5) - [ClassObjectType class=org.drools.compiler.integrationtests.Misc2Test$Foo2]] TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,182 [main] TRACE Segment 0
2014-02-25 05:00:16,182 [main] TRACE 4 [JoinNode(5) - [ClassObjectType class=org.drools.compiler.integrationtests.Misc2Test$Foo2]] TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,183 [main] TRACE rightTuples TupleSets[insertSize=0, deleteSize=0, updateSize=1]
2014-02-25 05:00:16,183 [main] TRACE Segment 1
2014-02-25 05:00:16,183 [main] TRACE 5 [NotNode(9) - [ClassObjectType class=org.drools.compiler.Person]] TupleSets[insertSize=0, deleteSize=0, updateSize=1]
2014-02-25 05:00:16,184 [main] TRACE Segment 1
2014-02-25 05:00:16,184 [main] TRACE 5 [NotNode(9) - [ClassObjectType class=org.drools.compiler.Person]] TupleSets[insertSize=0, deleteSize=0, updateSize=1]
2014-02-25 05:00:16,184 [main] TRACE rightTuples TupleSets[insertSize=1, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,184 [main] TRACE UnlinkNode notify=true nmask=1 smask=0 spos=1 rules=[RuleMem R2]
2014-02-25 05:00:16,185 [main] TRACE UnlinkSegment smask=2 rmask=1 name=[RuleMem R2]
2014-02-25 05:00:16,185 [main] TRACE UnlinkRule name=R2
2014-02-25 05:00:16,185 [main] TRACE Added R2 to eager evaluation list.
2014-02-25 05:00:16,185 [main] TRACE 6 [RuleTerminalNode(10): rule=R2] TupleSets[insertSize=0, deleteSize=1, updateSize=0]
2014-02-25 05:00:16,186 [main] TRACE Segment 1
2014-02-25 05:00:16,186 [main] TRACE 6 [RuleTerminalNode(10): rule=R2] TupleSets[insertSize=0, deleteSize=1, updateSize=0]
2014-02-25 05:00:16,187 [main] TRACE Rule[name=R2] segments=2 TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,187 [main] TRACE 7 [JoinNode(5) - [ClassObjectType class=org.drools.compiler.integrationtests.Misc2Test$Foo2]] TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,188 [main] TRACE Skip Segment 0
2014-02-25 05:00:16,188 [main] TRACE Segment 1
2014-02-25 05:00:16,188 [main] TRACE 7 [NotNode(9) - [ClassObjectType class=org.drools.compiler.Person]] TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,188 [main] TRACE rightTuples TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,188 [main] TRACE 8 [RuleTerminalNode(10): rule=R2] TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,189 [main] TRACE Segment 1
2014-02-25 05:00:16,189 [main] TRACE 8 [RuleTerminalNode(10): rule=R2] TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,189 [main] TRACE Rule[name=R2] segments=2 TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,189 [main] TRACE 9 [JoinNode(5) - [ClassObjectType class=org.drools.compiler.integrationtests.Misc2Test$Foo2]] TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,190 [main] TRACE Skip Segment 0
2014-02-25 05:00:16,190 [main] TRACE Segment 1
2014-02-25 05:00:16,190 [main] TRACE 9 [NotNode(9) - [ClassObjectType class=org.drools.compiler.Person]] TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,191 [main] TRACE rightTuples TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,191 [main] TRACE 10 [RuleTerminalNode(10): rule=R2] TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,191 [main] TRACE Segment 1
2014-02-25 05:00:16,191 [main] TRACE 10 [RuleTerminalNode(10): rule=R2] TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,192 [main] TRACE Rule[name=R1] segments=2 TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,192 [main] TRACE 11 [JoinNode(5) - [ClassObjectType class=org.drools.compiler.integrationtests.Misc2Test$Foo2]] TupleSets[insertSize=0, deleteSize=0, updateSize=0]
2014-02-25 05:00:16,192 [main] TRACE Skip Segment 0
2014-02-25 05:00:16,192 [main] TRACE Segment 1
2014-02-25 05:00:16,192 [main] TRACE 11 [JoinNode(7) - [ClassObjectType class=org.drools.compiler.Person]] TupleSets[insertSize=0, deleteSize=0, updateSize=1]
2014-02-25 05:00:16,193 [main] TRACE rightTuples TupleSets[insertSize=1, deleteSize=0, updateSize=0]
java.lang.NullPointerException
at org.drools.core.util.index.LeftTupleIndexHashTable.remove(LeftTupleIndexHashTable.java:386)
at org.drools.core.phreak.RuleNetworkEvaluator.doUpdatesReorderLeftMemory(RuleNetworkEvaluator.java:799)
10 years, 9 months
JBoss versioning policy - community 6.1 vs 7.0
by Mark Proctor
I’m providing some information on planned version policy changes within JBoss, that will most likely impact our next community release.
Currently the project vs product version numbering is considered confusing by some people; especially when both the project and the product are on the same major version number. One of the ways JBoss wishes to address this is for the community major version to automatically increment just prior to the product release - if the community is on the same version. For example as JBoss BRMS 6.0 is about to release, with community currently also on 6.0 the next community release would be required to move to 7.0, instead of 6.1. Community can then do 7.1, 7.2, 7.3 etc until the product shifts to 7.0. At which point the community much shift to 8.0.
Mark
10 years, 9 months
Semantic Web Drools Module, Request for Feedbak
by Xavier Breton
Hi,
I'm looking for feedback, I'll develop a Semantic Web Drools Module that
will be the subject of my Master Degree Tesis.
The idea is to use Eclipse Modelling Framework (EMF) for prototyping and
follow a Model Driven Architecture (MDA) where the source language is
Semantic of Business Vocabularies and Business Rules (SBVR) and the target
language is Drools DRL.
The mapping could be (PIM level):
- Semantic Web Rule Language (SWRL)
- Ontology Web Language (OWL)
- RuleML
- Rule Interchange Format (RIF)
- REWERSE Rule Markup Language (R2ML)
It could be added to the module at the source UML or Entity Relationship
like models to transform the models into SBVR.
Regards
Xavier Breton
10 years, 9 months
Fwd: [rules-users] ArrayIndexOutOfBoundsException under high events load in drools CEP
by Wolfgang Laun
IIRC, there were some rather positive statements during the evoluion
of 5.x that a session is thread-safe.
-W
---------- Forwarded message ----------
From: Davide Sottara <dsotty(a)gmail.com>
Date: Wed, 12 Feb 2014 19:12:32 +0100
Subject: Re: [rules-users] ArrayIndexOutOfBoundsException under high
events load in drools CEP
To: rules-users(a)lists.jboss.org
I can see a few independent issues here.
Drools 5.x was not designed to be thread-safe in general: there are some
known
critical races that may arise when multiple threads are inserting
facts in parallel. Many have been patched in 5.6, but the real
solution to the problem will be introduced in the 6.x series.
10 years, 9 months
