NPE loading Drools 5.4.0.Beta1 using drools-spring
by lhorton
I am trying to load up 5.4.0.Beta1. I'm using Spring configuration xml that
works fine in 5.2.0.Final. In the xml, my grid-node is defined as:
<drools:grid-node id="droolsClusterNode1"/>
The exception is a NPE on a method in WhitePagesClient. Any idea what the
cause might be? Has anyone successfully loaded 5.4.0 using Spring?
The full exception is:
ERROR 2012-01-06 15:51:05,998
[org.springframework.web.context.ContextLoader] - Context initialization
failed
org.springframework.beans.factory.BeanCreationException: Error creating bean
with name 'droolsClusterNode1': Invocation of init method failed; nested
exception is java.lang.NullPointerException
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1420)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
at
org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
at
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at
org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
at
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:563)
at
org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)
at
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)
at
org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:276)
at
org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:197)
at
org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
at
org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4206)
at
org.apache.catalina.core.StandardContext.start(StandardContext.java:4705)
at
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:943)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:563)
at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1399)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:297)
at
com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:836)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:761)
at
org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1500)
at
org.apache.catalina.manager.HTMLManagerServlet.doPost(HTMLManagerServlet.java:252)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.filters.CsrfPreventionFilter.doFilter(CsrfPreventionFilter.java:186)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:563)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:291)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.NullPointerException
at
org.drools.grid.service.directory.impl.WhitePagesClient.getGsd(WhitePagesClient.java:32)
at
org.drools.grid.service.directory.impl.WhitePagesClient.create(WhitePagesClient.java:80)
at org.drools.grid.impl.GridImpl.createGridNode(GridImpl.java:107)
at
org.drools.container.spring.beans.GridNodeBeanFactory.afterPropertiesSet(GridNodeBeanFactory.java:63)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1477)
at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1417)
... 47 more
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12 years, 4 months
Eclipse, Groovy and Drools - java.lang.NoClassDefFoundError
by sweeneymj
Hi,
I have just started trying out Drools and having an issue trying to run the
sample applications under Eclipse Helios with Groovy installed.
When I try run any sample Drools application I get the stack trace shown
below. I have looked around extensively on Google for assistance but have
been unable to find any thing that has helped me determine what the issue
is.
Any suggestions would be appreciated.
Regards
--
Build groovy files option has not been set one way or the other: use
'options.put(CompilerOptions.OPTIONG_BuildGroovyFiles,
CompilerOptions.ENABLED);'
java.lang.NoClassDefFoundError: org/eclipse/core/runtime/Plugin
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at
org.eclipse.jdt.internal.compiler.Compiler.initializeParser(Compiler.java:737)
at
org.eclipse.jdt.internal.compiler.Compiler.<init>(Compiler.java:294)
at
org.eclipse.jdt.internal.compiler.Compiler.<init>(Compiler.java:159)
at
org.drools.commons.jci.compilers.EclipseJavaCompiler.compile(EclipseJavaCompiler.java:364)
at
org.drools.commons.jci.compilers.AbstractJavaCompiler.compile(AbstractJavaCompiler.java:51)
at
org.drools.rule.builder.dialect.java.JavaDialect.compileAll(JavaDialect.java:366)
at
org.drools.compiler.DialectCompiletimeRegistry.compileAll(DialectCompiletimeRegistry.java:55)
at
org.drools.compiler.PackageRegistry.compileAll(PackageRegistry.java:69)
at
org.drools.compiler.PackageBuilder.compileAll(PackageBuilder.java:674)
at
org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:633)
at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:278)
at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:451)
at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
at com.sample.DroolsTest.readKnowledgeBase(DroolsTest.java:40)
at com.sample.DroolsTest.main(DroolsTest.java:23)
Caused by: java.lang.ClassNotFoundException: org.eclipse.core.runtime.Plugin
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 27 more
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12 years, 4 months
Inserting Facts from Json Format
by ihabo01
Hello to all,
I have the following simple rule:
declare FlatData
param1 : String
param2 : String
end
rule "Test"
when
a:FlatData(param1=="something")
then
a.setParam2("hi");
end
And I have the following code to load the rule:
KnowledgeBuilder kBuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kBuilder.add(ResourceFactory.newFileResource("myRule.drl"),ResourceType.DRL);
KnowledgeBaseConfiguration kBaseConfig = KnowledgeBaseFactory
.newKnowledgeBaseConfiguration();
KnowledgeBase kBase = KnowledgeBaseFactory.newKnowledgeBase(kBaseConfig);
kBase.addKnowledgePackages(kBuilder.getKnowledgePackages());
StatefulKnowledgeSession session = kBase.newStatefulKnowledgeSession();
session.fireAllRules();
And I have also the following object (in Json) that I would like to insert
as a fact just before firing the rules:
{"object":{" FlatData ":{"param1":"value1","param2":”value2”}}}}
How can I achieve that?
Many thanks in advance for your help
Ihab
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12 years, 5 months
KnowledgeAgent custom class loader not working for PKG resources
by Hrumph
I believe there may be a bug when trying to use a custom class loader with
the KnowledgeAgent and the KnowledgeBuilderConfiguration, and when the
ChangeSet is a PKG resource.
I have been trying to get the knowledge-agent-classloader sample from the
new Drools Cookbook to work with a PKG resource. The sample works fine for
a DRL resource, but when I convert it to use my fact jar, and a PKG resource
containing my rules, which I downloaded from Guvnor, it throws a
ClassNotFoundException for my fact model. If I put my fact model in the
classpath, the error goes away and my rules can be added to the
KnowledgeAgent and run correctly. Following is the code from the sample
that I have converted, and I have attached a zip file with a complete
project demonstrating the problem. Also, I can get my rules and fact
model to work if I use a DRL ChangeSet.knowledge-agent-classloader.zip
URL modelJarURL = getClass().getResource("Patient-1.0.jar");
URLClassLoader customURLClassloader = new URLClassLoader(new URL[]
{modelJarURL });
KnowledgeBuilderConfiguration kbuilderConfig =
KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(null,
customURLClassloader);
KnowledgeBaseConfiguration kbaseConfig =
KnowledgeBaseFactory.newKnowledgeBaseConfiguration(null,
customURLClassloader);
KnowledgeBase kbase =
KnowledgeBaseFactory.newKnowledgeBase(kbaseConfig);
KnowledgeAgentConfiguration aconf =
KnowledgeAgentFactory.newKnowledgeAgentConfiguration();
KnowledgeAgent kagent =
KnowledgeAgentFactory.newKnowledgeAgent("test", kbase, aconf,
kbuilderConfig);
// kagent.applyChangeSet(new ClassPathResource("change-set.xml",
getClass())); // this goes with model.jar
// kagent.applyChangeSet(new ClassPathResource("drl-change-set.xml",
getClass())); // this goes with Patient.jar
kagent.applyChangeSet(new ClassPathResource("pkg-change-set.xml",
getClass())); // this goes with Patient.jar
return kagent.getKnowledgeBase();
Following is the stack trace from the error:
java.lang.NullPointerException
at
org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:148)
at
org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:1016)
at
org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources(KnowledgeAgentImpl.java:785)
at
org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:657)
at
org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:190)
at
org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:169)
at
drools.cookbook.chapter02.KnowledgeAgentClassloaderTest.createKnowledgeBase(KnowledgeAgentClassloaderTest.java:59)
at
drools.cookbook.chapter02.KnowledgeAgentClassloaderTest.customClassloaderTest(KnowledgeAgentClassloaderTest.java:30)
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 org.junit.internal.runners.TestMethod.invoke(TestMethod.java:59)
at
org.junit.internal.runners.MethodRoadie.runTestMethod(MethodRoadie.java:98)
at
org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:79)
at
org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:87)
at
org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:77)
at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:42)
at
org.junit.internal.runners.JUnit4ClassRunner.invokeTestMethod(JUnit4ClassRunner.java:88)
at
org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)
at
org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)
at
org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27)
at
org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37)
at
org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)
at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
I have been having the exact same problem when trying to use a custom class
loader with just a KnowldegeBuilder and no KnowledgeAgent.
http://drools.46999.n3.nabble.com/file/n3746456/knowledge-agent-classload...
knowledge-agent-classloader.zip
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12 years, 6 months
traits - don more than 3 pojos, got IllegalArgumentException
by Michal Bali
Hi all,
I came across this issue when trying out 'traits' with POJOs (not declared
types). An IllegalArgumentException is being thrown when I apply the third
'don'. Here is how to reproduce:
as the POJO I am using the Message class that comes with the project
created by the Eclipse plugin.
now the rule file:
declare Message
@Traitable
end
declare NiceMessage
@format(trait)
end
rule load
when
then
Message message = new Message();
message.setMessage("Hello World");
insert(message);
don(message, NiceMessage.class);
Message unreadMessage = new Message();
unreadMessage.setMessage("unread");
insert(unreadMessage);
don(unreadMessage, NiceMessage.class);
Message oldMessage = new Message();
oldMessage.setMessage("old");
insert(oldMessage);
System.out.println("don " + oldMessage);
don(oldMessage, NiceMessage.class); //*<--- exception happens here*
System.out.println("wont reach this point");
end
When I run this and rule 'load' fires the third 'don' will throw the
following exception:
Exception executing consequence for rule "load" in com.mycompany.app:
java.lang.IllegalArgumentException: argument type mismatch
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1101)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1029)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1251)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:709)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:673)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:221)
at com.mycompany.app.DroolsTest.main(DroolsTest.java:44)
Caused by: java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
at
org.drools.factmodel.traits.TraitFactory.getProxy(TraitFactory.java:92)
at
org.drools.base.DefaultKnowledgeHelper.don(DefaultKnowledgeHelper.java:502)
at
org.drools.base.DefaultKnowledgeHelper.don(DefaultKnowledgeHelper.java:522)
at
com.mycompany.app.Rule_load_86ecf966a4c14d8486844cfae2e1e0d8.defaultConsequence(Rule_load_86ecf966a4c14d8486844cfae2e1e0d8.java:21)
at
com.mycompany.app.Rule_load_86ecf966a4c14d8486844cfae2e1e0d8DefaultConsequenceInvokerGenerated.evaluate(Unknown
Source)
at
com.mycompany.app.Rule_load_86ecf966a4c14d8486844cfae2e1e0d8DefaultConsequenceInvoker.evaluate(Unknown
Source)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1091)
... 6 more
Am I doing something wrong or is this a bug. I am running with 5.4.0.Beta2.
BTW traits are a great piece of functionality. Thank you!
Best regards,
Michal
12 years, 6 months
Drools verifier
by FrankVhh
Hi all,
Triggered by a post on this forum, I decided to try a testcase
implementation of Drool Verifiier.
I manage to write some code that does not produce any errors at runtime,
which is good. Unfortunately, it doesn't produce any errors/warnings/notes
on my rulefile either, which isn't good.
The drl file consists of some duplicate rules, and since the file is only
part of a ruleset, there might be some gaps as well.
I pasted the java-code below. Does anyone see where I am going wrong?
Thanks in advance!
Regards,
Frank
VerifierBuilder vBuilder =
VerifierBuilderFactory.newVerifierBuilder();
Verifier verifier = vBuilder.newVerifier();
String ruleText =
"C:\\Users\\Frank\\Documents\\DroolsWorkSpaces\\EmpiricalExperiments\\Financial
Rules\\src\\main\\rules\\clearancerules.drl";
verifier.addResourcesToVerify( ResourceFactory.newReaderResource(
new StringReader( ruleText ) ), ResourceType.DRL );
verifier.fireAnalysis();
VerifierReport result = verifier.getResult();
for(VerifierMessageBase base: result.getBySeverity(
Severity.ERROR ) ){
System.out.println( base );
}
for(VerifierMessageBase base: result.getBySeverity(
Severity.WARNING ) ){
System.out.println( base );
}
for(VerifierMessageBase base: result.getBySeverity( Severity.NOTE )
){
System.out.println( base );
}
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12 years, 6 months
Challenge! Using javassist and drools presents an issue with drl
by markricard
In order to make writing drl files easy and not requiring writers to be
developers, I have written some JavaAssist code that dynamically creates a
subclass and new methods in memory.
If for example there is a REAL java class called 'com.foo.Instance'. Via
javasssist, I create a new in-memory subclass called 'com.foo.InstanceEx'.
The new class dynamically creates a new getter called getFoo(). The drl
writer would like to directly reference 'foo' in the drl file like so:
when
i : Instance(foo == 'fee')
The problem is, in order to reference foo, I would need the drl file to do
this:
import com.rrd.xspace.drools.InstanceEx;
But I cannot do that because InstanceEx does not exist at runtime. The
error I get, which is an obvious one, is "Unable to create Field Extractor
for 'foo' of '[ClassObjectType class=com.foo.Instance]' in rule 'Test' :
[Rule name='Test']"
Is there a way to include a dynamic import of a JavaAssist class while I am
constructing the KnowledgeBase instances to run the rules so that I can
reference that new method?
I would hope to have something similar to:
KnowledgeBuilder kbuilder = ....
kbuilder.addImport("com.foo.InstanceEx")
or
kbuilder.addClass(Class.forName("com.foo.InstanceEx"))
Any help GREATLY appreciated.
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12 years, 7 months
Why is solving a partial puzzle much slower than generating one from scratch?
by aitchnyu
I am making a 3x3 Sudoku solver with Drools planner. The planning entities
are the digits. The problem facts are the rows (planning variable) and
columns.
When I set Drools Planner to solve a problem where no digit is initialized,
it gives a perfect solution in ~15 secs. But when I set a few digits as
initialized, it never finds a solution. It always lists 8 hard constraints
broken on termination.
I implemented the moves as:
if(digit.getFixed()==false){
moveList.add(new RowChangeMove(digit, toRow));
}
If the digit is fixed, dont make a move object for it.
Earlier, I implemented it in isMoveDoable: if the digit.getFixed() is true,
it returns false. Both do not work.
20:31:13.442 [main] INFO o.d.p.c.l.DefaultLocalSearchSolverPhase - Phase
local search finished: step total (978), time spend (60061), best score
(-8).
20:31:13.442 [main] INFO o.d.p.core.solver.DefaultSolver - Solved: time
spend (60061), best score (-8), average calculate count per second (7433).
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12 years, 7 months
