10:18 p.m.
MVEL parser uses wrong precedence for []
----------------------------------------
Key: JBRULES-1460
URL: http://jira.jboss.com/jira/browse/JBRULES-1460
Project: JBoss Drools
Issue Type: Bug
Security Level: Public (Everyone can see)
Affects Versions: 4.0.4
Reporter: Godmar Back
Consider this .drl file:
--
package test;
import java.util.ArrayList;
import java.util.HashMap;
dialect "mvel"
rule "Rule #1"
when
then
m = new HashMap();
l = new ArrayList();
l.add("first");
m.put("content", l);
System.out.println(m["content"][0]);
end
---
which produces:
org.mvel.PropertyAccessException: unable to resolve property:
out.println(m["content"][0])
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:285)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:107)
at
org.mvel.ast.LiteralDeepPropertyNode.getReducedValueAccelerated(LiteralDeepPropertyNode.java:26)
at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
at org.mvel.CompiledExpression.getValue(CompiledExpression.java:107)
at org.mvel.MVEL.executeExpression(MVEL.java:223)
at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:47)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:550)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:514)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:471)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:433)
at org.libx.autodetect.DroolsDriver$Host.fireAllRules(DroolsDriver.java:63)
at org.libx.autodetect.DroolsDriver.main(DroolsDriver.java:135)
Caused by: org.mvel.PropertyAccessException: unable to resolve property: unable to resolve
method: java.io.PrintStream.println(java.util.ArrayList, org.mvel.util.FastList)
[arglength=2]
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:558)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:257)
... 12 more
Exception in thread "main" org.drools.spi.ConsequenceException:
org.mvel.PropertyAccessException: unable to resolve property:
out.println(m["content"][0])
at
org.drools.base.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:14)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:554)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:514)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:471)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:433)
at org.libx.autodetect.DroolsDriver$Host.fireAllRules(DroolsDriver.java:63)
at org.libx.autodetect.DroolsDriver.main(DroolsDriver.java:135)
Caused by: org.mvel.PropertyAccessException: unable to resolve property:
out.println(m["content"][0])
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:285)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:107)
at
org.mvel.ast.LiteralDeepPropertyNode.getReducedValueAccelerated(LiteralDeepPropertyNode.java:26)
at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
at org.mvel.CompiledExpression.getValue(CompiledExpression.java:107)
at org.mvel.MVEL.executeExpression(MVEL.java:223)
at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:47)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:550)
... 5 more
Caused by: org.mvel.PropertyAccessException: unable to resolve property: unable to resolve
method: java.io.PrintStream.println(java.util.ArrayList, org.mvel.util.FastList)
[arglength=2]
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:558)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:257)
... 12 more
but changing:
System.out.println(m["content"][0]);
to
System.out.println((m["content"])[0]);
works. (So does assigning m["content"] to a temporary variable.)
BTW: if you say that's a MVEL issue, not a Drools issue, consider that I have no other
reason to use MVEL than to be able to use Drools. That's why I filed this bug here. I
don't know how to run MVEL in any other environment, nor am I interested in it -
I'd rather use a mature scripting language (beanshell comes to mind) that doesn't
exhibit such basic bugs. Why don't you?
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10:48 p.m.
New subject: [JBoss JIRA] Commented: (JBRULES-1460) MVEL parser uses wrong precedence for []
[ http://jira.jboss.com/jira/browse/JBRULES-1460?page=comments#action_12402327 ]
Mark Proctor commented on JBRULES-1460:
---------------------------------------
Early versions of Drools used Beanshell, years back. Trust me we are far better off
without it. I'll ping the MVEL author to see if we can get this fixed for the next
MVEL release.
MVEL parser uses wrong precedence for []
----------------------------------------
Key: JBRULES-1460
URL: http://jira.jboss.com/jira/browse/JBRULES-1460
Project: JBoss Drools
Issue Type: Bug
Security Level: Public(Everyone can see)
Affects Versions: 4.0.4
Reporter: Godmar Back
Consider this .drl file:
--
package test;
import java.util.ArrayList;
import java.util.HashMap;
dialect "mvel"
rule "Rule #1"
when
then
m = new HashMap();
l = new ArrayList();
l.add("first");
m.put("content", l);
System.out.println(m["content"][0]);
end
---
which produces:
org.mvel.PropertyAccessException: unable to resolve property:
out.println(m["content"][0])
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:285)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:107)
at
org.mvel.ast.LiteralDeepPropertyNode.getReducedValueAccelerated(LiteralDeepPropertyNode.java:26)
at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
at org.mvel.CompiledExpression.getValue(CompiledExpression.java:107)
at org.mvel.MVEL.executeExpression(MVEL.java:223)
at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:47)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:550)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:514)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:471)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:433)
at org.libx.autodetect.DroolsDriver$Host.fireAllRules(DroolsDriver.java:63)
at org.libx.autodetect.DroolsDriver.main(DroolsDriver.java:135)
Caused by: org.mvel.PropertyAccessException: unable to resolve property: unable to
resolve method: java.io.PrintStream.println(java.util.ArrayList, org.mvel.util.FastList)
[arglength=2]
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:558)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:257)
... 12 more
Exception in thread "main" org.drools.spi.ConsequenceException:
org.mvel.PropertyAccessException: unable to resolve property:
out.println(m["content"][0])
at
org.drools.base.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:14)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:554)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:514)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:471)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:433)
at org.libx.autodetect.DroolsDriver$Host.fireAllRules(DroolsDriver.java:63)
at org.libx.autodetect.DroolsDriver.main(DroolsDriver.java:135)
Caused by: org.mvel.PropertyAccessException: unable to resolve property:
out.println(m["content"][0])
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:285)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:107)
at
org.mvel.ast.LiteralDeepPropertyNode.getReducedValueAccelerated(LiteralDeepPropertyNode.java:26)
at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
at org.mvel.CompiledExpression.getValue(CompiledExpression.java:107)
at org.mvel.MVEL.executeExpression(MVEL.java:223)
at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:47)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:550)
... 5 more
Caused by: org.mvel.PropertyAccessException: unable to resolve property: unable to
resolve method: java.io.PrintStream.println(java.util.ArrayList, org.mvel.util.FastList)
[arglength=2]
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:558)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:257)
... 12 more
but changing:
System.out.println(m["content"][0]);
to
System.out.println((m["content"])[0]);
works. (So does assigning m["content"] to a temporary variable.)
BTW: if you say that's a MVEL issue, not a Drools issue, consider that I have no
other reason to use MVEL than to be able to use Drools. That's why I filed this bug
here. I don't know how to run MVEL in any other environment, nor am I interested in it
- I'd rather use a mature scripting language (beanshell comes to mind) that
doesn't exhibit such basic bugs. Why don't you?
--
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11:28 p.m.
New subject: [JBoss JIRA] Commented: (JBRULES-1460) MVEL parser uses wrong precedence for []
[ http://jira.jboss.com/jira/browse/JBRULES-1460?page=comments#action_12402335 ]
Michael Neale commented on JBRULES-1460:
----------------------------------------
But, its an MVEL iss..... sorry ;) couldn't resist /joke ;)
Mike is going to take a look into this.
Oh, and beanshell had far more issues (the most mature would be javascript/rhino - but
that has other quirks - but its worth considering a dialect of it).
MVEL parser uses wrong precedence for []
----------------------------------------
Key: JBRULES-1460
URL: http://jira.jboss.com/jira/browse/JBRULES-1460
Project: JBoss Drools
Issue Type: Bug
Security Level: Public(Everyone can see)
Affects Versions: 4.0.4
Reporter: Godmar Back
Consider this .drl file:
--
package test;
import java.util.ArrayList;
import java.util.HashMap;
dialect "mvel"
rule "Rule #1"
when
then
m = new HashMap();
l = new ArrayList();
l.add("first");
m.put("content", l);
System.out.println(m["content"][0]);
end
---
which produces:
org.mvel.PropertyAccessException: unable to resolve property:
out.println(m["content"][0])
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:285)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:107)
at
org.mvel.ast.LiteralDeepPropertyNode.getReducedValueAccelerated(LiteralDeepPropertyNode.java:26)
at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
at org.mvel.CompiledExpression.getValue(CompiledExpression.java:107)
at org.mvel.MVEL.executeExpression(MVEL.java:223)
at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:47)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:550)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:514)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:471)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:433)
at org.libx.autodetect.DroolsDriver$Host.fireAllRules(DroolsDriver.java:63)
at org.libx.autodetect.DroolsDriver.main(DroolsDriver.java:135)
Caused by: org.mvel.PropertyAccessException: unable to resolve property: unable to
resolve method: java.io.PrintStream.println(java.util.ArrayList, org.mvel.util.FastList)
[arglength=2]
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:558)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:257)
... 12 more
Exception in thread "main" org.drools.spi.ConsequenceException:
org.mvel.PropertyAccessException: unable to resolve property:
out.println(m["content"][0])
at
org.drools.base.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:14)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:554)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:514)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:471)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:433)
at org.libx.autodetect.DroolsDriver$Host.fireAllRules(DroolsDriver.java:63)
at org.libx.autodetect.DroolsDriver.main(DroolsDriver.java:135)
Caused by: org.mvel.PropertyAccessException: unable to resolve property:
out.println(m["content"][0])
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:285)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:107)
at
org.mvel.ast.LiteralDeepPropertyNode.getReducedValueAccelerated(LiteralDeepPropertyNode.java:26)
at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
at org.mvel.CompiledExpression.getValue(CompiledExpression.java:107)
at org.mvel.MVEL.executeExpression(MVEL.java:223)
at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:47)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:550)
... 5 more
Caused by: org.mvel.PropertyAccessException: unable to resolve property: unable to
resolve method: java.io.PrintStream.println(java.util.ArrayList, org.mvel.util.FastList)
[arglength=2]
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:558)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:257)
... 12 more
but changing:
System.out.println(m["content"][0]);
to
System.out.println((m["content"])[0]);
works. (So does assigning m["content"] to a temporary variable.)
BTW: if you say that's a MVEL issue, not a Drools issue, consider that I have no
other reason to use MVEL than to be able to use Drools. That's why I filed this bug
here. I don't know how to run MVEL in any other environment, nor am I interested in it
- I'd rather use a mature scripting language (beanshell comes to mind) that
doesn't exhibit such basic bugs. Why don't you?
--
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10:50 a.m.
New subject: [JBoss JIRA] Commented: (JBRULES-1460) MVEL parser uses wrong precedence for []
[ http://jira.jboss.com/jira/browse/JBRULES-1460?page=comments#action_12402483 ]
Godmar Back commented on JBRULES-1460:
--------------------------------------
However the reasoning behind the choice of MVEL may be, as of now, I've suspended my
work with Drools hoping for a more stable parser.
I had sent Ed off-JIRA two fully-self contained test setups where Drools/MVEL runs out of
memory. Due to the nature of the code involved, I don't want to post them publicly.
I also think the following case still fails (reported under
http://jira.jboss.com/jira/browse/JBRULES-1461 - though I was mistaken to attribute this
problem in that JIRA to the wrong MVEL version, it occurs with the blessed one as well.)
--
package test;
dialect "mvel"
rule "Rule #1"
when
then
System.out.println("now computing 1+1...");
Integer two = new Integer(2);
System.out.println(two);
end
--
Thanks.
MVEL parser uses wrong precedence for []
----------------------------------------
Key: JBRULES-1460
URL: http://jira.jboss.com/jira/browse/JBRULES-1460
Project: JBoss Drools
Issue Type: Bug
Security Level: Public(Everyone can see)
Affects Versions: 4.0.4
Reporter: Godmar Back
Consider this .drl file:
--
package test;
import java.util.ArrayList;
import java.util.HashMap;
dialect "mvel"
rule "Rule #1"
when
then
m = new HashMap();
l = new ArrayList();
l.add("first");
m.put("content", l);
System.out.println(m["content"][0]);
end
---
which produces:
org.mvel.PropertyAccessException: unable to resolve property:
out.println(m["content"][0])
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:285)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:107)
at
org.mvel.ast.LiteralDeepPropertyNode.getReducedValueAccelerated(LiteralDeepPropertyNode.java:26)
at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
at org.mvel.CompiledExpression.getValue(CompiledExpression.java:107)
at org.mvel.MVEL.executeExpression(MVEL.java:223)
at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:47)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:550)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:514)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:471)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:433)
at org.libx.autodetect.DroolsDriver$Host.fireAllRules(DroolsDriver.java:63)
at org.libx.autodetect.DroolsDriver.main(DroolsDriver.java:135)
Caused by: org.mvel.PropertyAccessException: unable to resolve property: unable to
resolve method: java.io.PrintStream.println(java.util.ArrayList, org.mvel.util.FastList)
[arglength=2]
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:558)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:257)
... 12 more
Exception in thread "main" org.drools.spi.ConsequenceException:
org.mvel.PropertyAccessException: unable to resolve property:
out.println(m["content"][0])
at
org.drools.base.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:14)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:554)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:514)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:471)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:433)
at org.libx.autodetect.DroolsDriver$Host.fireAllRules(DroolsDriver.java:63)
at org.libx.autodetect.DroolsDriver.main(DroolsDriver.java:135)
Caused by: org.mvel.PropertyAccessException: unable to resolve property:
out.println(m["content"][0])
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:285)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:107)
at
org.mvel.ast.LiteralDeepPropertyNode.getReducedValueAccelerated(LiteralDeepPropertyNode.java:26)
at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
at org.mvel.CompiledExpression.getValue(CompiledExpression.java:107)
at org.mvel.MVEL.executeExpression(MVEL.java:223)
at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:47)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:550)
... 5 more
Caused by: org.mvel.PropertyAccessException: unable to resolve property: unable to
resolve method: java.io.PrintStream.println(java.util.ArrayList, org.mvel.util.FastList)
[arglength=2]
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:558)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:257)
... 12 more
but changing:
System.out.println(m["content"][0]);
to
System.out.println((m["content"])[0]);
works. (So does assigning m["content"] to a temporary variable.)
BTW: if you say that's a MVEL issue, not a Drools issue, consider that I have no
other reason to use MVEL than to be able to use Drools. That's why I filed this bug
here. I don't know how to run MVEL in any other environment, nor am I interested in it
- I'd rather use a mature scripting language (beanshell comes to mind) that
doesn't exhibit such basic bugs. Why don't you?
--
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11:16 a.m.
New subject: [JBoss JIRA] Closed: (JBRULES-1460) MVEL parser uses wrong precedence for []
[ http://jira.jboss.com/jira/browse/JBRULES-1460?page=all ]
Mark Proctor closed JBRULES-1460.
---------------------------------
Resolution: Cannot Reproduce Bug
Assignee: Mark Proctor
I've been unable to reproduce this bug, maybe you are using an older version than
4.0.4? Anyway we have added your unit test to the 4.0.x branch and trunk. You can see
those added tests in the svn commot tab for this JIRA, please review that we aren't
mistaking what you are reporting. This is what the test currently looks like, please
re-open if you think there is still a problem:
public void testMVELConsequenceWithMapsAndArrays() throws Exception {
String rule = "package org.test;\n";
rule += "import java.util.ArrayList\n";
rule += "import java.util.HashMap\n";
rule += "global java.util.List list\n";
rule += "rule \"Test Rule\"\n";
rule += " dialect \"mvel\"";
rule += "when\n";
rule += "then\n";
rule += " m = new HashMap();\n";
rule += " l = new ArrayList();\n";
rule += " l.add(\"first\");\n";
rule += " m.put(\"content\", l);\n";
rule += " System.out.println(m[\"content\"][0]);\n";
rule += " list.add(m[\"content\"][0]);\n";
rule += "end";
final PackageBuilder builder = new PackageBuilder();
builder.addPackageFromDrl( new StringReader( rule ));
final Package pkg = builder.getPackage();
final RuleBase ruleBase = getRuleBase();
ruleBase.addPackage(pkg);
final StatefulSession session = ruleBase.newStatefulSession();
List list = new ArrayList();
session.setGlobal( "list", list );
session.fireAllRules();
assertEquals( 1, list.size() );
assertEquals( "first", list.get( 0 ) );
}
MVEL parser uses wrong precedence for []
----------------------------------------
Key: JBRULES-1460
URL: http://jira.jboss.com/jira/browse/JBRULES-1460
Project: JBoss Drools
Issue Type: Bug
Security Level: Public(Everyone can see)
Affects Versions: 4.0.4
Reporter: Godmar Back
Assigned To: Mark Proctor
Consider this .drl file:
--
package test;
import java.util.ArrayList;
import java.util.HashMap;
dialect "mvel"
rule "Rule #1"
when
then
m = new HashMap();
l = new ArrayList();
l.add("first");
m.put("content", l);
System.out.println(m["content"][0]);
end
---
which produces:
org.mvel.PropertyAccessException: unable to resolve property:
out.println(m["content"][0])
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:285)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:107)
at
org.mvel.ast.LiteralDeepPropertyNode.getReducedValueAccelerated(LiteralDeepPropertyNode.java:26)
at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
at org.mvel.CompiledExpression.getValue(CompiledExpression.java:107)
at org.mvel.MVEL.executeExpression(MVEL.java:223)
at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:47)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:550)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:514)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:471)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:433)
at org.libx.autodetect.DroolsDriver$Host.fireAllRules(DroolsDriver.java:63)
at org.libx.autodetect.DroolsDriver.main(DroolsDriver.java:135)
Caused by: org.mvel.PropertyAccessException: unable to resolve property: unable to
resolve method: java.io.PrintStream.println(java.util.ArrayList, org.mvel.util.FastList)
[arglength=2]
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:558)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:257)
... 12 more
Exception in thread "main" org.drools.spi.ConsequenceException:
org.mvel.PropertyAccessException: unable to resolve property:
out.println(m["content"][0])
at
org.drools.base.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:14)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:554)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:514)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:471)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:433)
at org.libx.autodetect.DroolsDriver$Host.fireAllRules(DroolsDriver.java:63)
at org.libx.autodetect.DroolsDriver.main(DroolsDriver.java:135)
Caused by: org.mvel.PropertyAccessException: unable to resolve property:
out.println(m["content"][0])
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:285)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:107)
at
org.mvel.ast.LiteralDeepPropertyNode.getReducedValueAccelerated(LiteralDeepPropertyNode.java:26)
at org.mvel.MVELRuntime.execute(MVELRuntime.java:88)
at org.mvel.CompiledExpression.getValue(CompiledExpression.java:107)
at org.mvel.MVEL.executeExpression(MVEL.java:223)
at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:47)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:550)
... 5 more
Caused by: org.mvel.PropertyAccessException: unable to resolve property: unable to
resolve method: java.io.PrintStream.println(java.util.ArrayList, org.mvel.util.FastList)
[arglength=2]
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:558)
at
org.mvel.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:257)
... 12 more
but changing:
System.out.println(m["content"][0]);
to
System.out.println((m["content"])[0]);
works. (So does assigning m["content"] to a temporary variable.)
BTW: if you say that's a MVEL issue, not a Drools issue, consider that I have no
other reason to use MVEL than to be able to use Drools. That's why I filed this bug
here. I don't know how to run MVEL in any other environment, nor am I interested in it
- I'd rather use a mature scripting language (beanshell comes to mind) that
doesn't exhibit such basic bugs. Why don't you?
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6646
days inactive
6677
days old
4 comments
3 participants
participants (3)
-
Godmar Back (JIRA) -
Mark Proctor (JIRA)
-
Michael Neale (JIRA)