I had a queue which iwas able to write to, but at a certain point was
unable to read from.
The queue monitor showed 30000 + messages in it. The activemq program had
been up for around 17 days working under the same approximate load...There
was only one program that should have been reading the queue and normally
when looking at the ActiveMQ web monitor I see 1 consumer, but the monitor
was showing 16 consumers. It is very unlikely that there were addtional
programs on our network trying to read from the queue. After the perl
programs that were reading or writing to the queue were killed there were 15
consumers listed. I sent a few messages to the queue via the send function
on the monitor and the number of consumers jumped to 21. I killed the
activemq and restarted it and the number of consumers went back down to 0.
I noticed that there is a queue with no name showing up in the monitor now
as well.
The perl code I am using to read from looks like this
my $stomp = Net::Stomp->new( { hostname => 'localhost', port => '61613' } )
or die;
$stomp->connect( { login => 'activemq', passcode => 'activemq' } ) or die;
$stomp->subscribe({
'destination' => '/queue/to_omni_crs',
'ack' => 'client',
'activemq.prefetchSize' => 1,
});
sub blah {...
while (1) {
unless ($stomp->can_read({timeout => 15})) {
$nothing_count++;
$logger->debug("Nothing to read ($nothing_count)...");
return 1;
}
#do stuff...
}
I am using this version of Activemq under SUSE Linux
=============================
./activemq --version
ACTIVEMQ_HOME: /usr/local/activemq
ACTIVEMQ_BASE: /usr/local/activemq
ActiveMQ 5.1.0
For help or more information please see: http://activemq.apache.org
here is an error that occured in the log about 8 times in two hours.
008-06-10 10:55:20,984 [btpool0-3 ] INFO TransportConnector
- Connector vm://localhost Started
2008-06-27 13:59:32,063 [btpool0-402 ] ERROR log
- Nested in org.apache.jasper.JasperException:
javax.el.PropertyNotFoundException: The class
'org.apache.activemq.web.MessageQuery' does not have the property
'JMSMessageID'.:
javax.el.PropertyNotFoundException: The class
'org.apache.activemq.web.MessageQuery' does not have the property
'JMSMessageID'.
at javax.el.BeanELResolver.getBeanProperty(BeanELResolver.java:547)
at javax.el.BeanELResolver.getValue(BeanELResolver.java:249)
at
javax.el.CompositeELResolver.getValue(CompositeELResolver.java:143)
at com.sun.el.parser.AstValue.getValue(AstValue.java:138)
at
com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:206)
at
org.apache.jasper.runtime.PageContextImpl.evaluateExpression(PageContextImpl.java:984)
at
org.apache.jsp.message_jsp._jspx_meth_c_when_0(org.apache.jsp.message_jsp:182)
at
org.apache.jsp.message_jsp._jspx_meth_c_choose_0(org.apache.jsp.message_jsp:146)
at
org.apache.jsp.message_jsp._jspService(org.apache.jsp.message_jsp:92)
at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:93)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:470)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:364)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
at
org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:63)
at
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at
org.apache.activemq.web.SessionFilter.doFilter(SessionFilter.java:46)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at
org.apache.activemq.web.filter.ApplicationContextFilter.doFilter(ApplicationContextFilter.java:81)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at
com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)
at
com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
at
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726)
at
org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at
org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:828)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at
org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:450)
I also had this error writing to stderr from my perl program
se of uninitialized value in length at
/usr/lib/perl5/site_perl/5.8.8/POE/Component/Client/Stomp/Utils.pm line 174,
<GEN0> line 3.
I am pretty certain that I am acking everytime I read, I have seen this
error before when I fail to ack.
Finally Here is a copy of our config file...
omares-liaison1:/usr/local/activemq/conf # cat active*xml
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!-- START SNIPPET: example -->
<beans
xmlns="http://www.springframework.org/schema/beans";
xmlns:amq="http://activemq.apache.org/schema/core";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://activemq.apache.org/schema/core
http://activemq.apache.org/schema/core/activemq-core.xsd
http://activemq.apache.org/camel/schema/spring
http://activemq.apache.org/camel/schema/spring/camel-spring.xsd";>
<!-- Allows us to use system properties as variables in this
configuration file -->
<bean
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"/>
<broker xmlns="http://activemq.apache.org/schema/core";
brokerName="localhost" dataDirectory="${activemq.base}/data">
<!-- Destination specific policies using destination names or
wildcards -->
<destinationPolicy>
<policyMap>
<policyEntries>
<policyEntry queue=">" memoryLimit="5mb"/>
<policyEntry topic=">" memoryLimit="5mb">
<dispatchPolicy>
<strictOrderDispatchPolicy/>
</dispatchPolicy>
<subscriptionRecoveryPolicy>
<lastImageSubscriptionRecoveryPolicy/>
</subscriptionRecoveryPolicy>
</policyEntry>
</policyEntries>
</policyMap>
</destinationPolicy>
<!-- Use the following to configure how ActiveMQ is exposed in JMX
-->
<managementContext>
<managementContext createConnector="false"/>
</managementContext>
<!-- The store and forward broker networks ActiveMQ will listen to
-->
<networkConnectors>
<!-- by default just auto discover the other brokers
<networkConnector name="default-nc" uri="multicast://default"/>
-->
<!-- Example of a static configuration:
<networkConnector name="host1 and host2"
uri="static://(tcp://host1:61616,tcp://host2:61616)"/>
-->
</networkConnectors>
<persistenceAdapter>
<amqPersistenceAdapter syncOnWrite="false"
directory="${activemq.base}/data" maxFileLength="20 mb"/>
</persistenceAdapter>
<!-- Use the following if you wish to configure the journal with
JDBC -->
<!--
<persistenceAdapter>
<journaledJDBC dataDirectory="${activemq.base}/data"
dataSource="#postgres-ds"/>
</persistenceAdapter>
-->
<!-- Or if you want to use pure JDBC without a journal -->
<!--
<persistenceAdapter>
<jdbcPersistenceAdapter dataSource="#postgres-ds"/>
</persistenceAdapter>
-->
<!-- The maximum about of space the broker will use before slowing
down producers -->
<systemUsage>
<systemUsage>
<memoryUsage>
<memoryUsage limit="20 mb"/>
</memoryUsage>
<storeUsage>
<storeUsage limit="1 gb" name="foo"/>
</storeUsage>
<tempUsage>
<tempUsage limit="100 mb"/>
</tempUsage>
</systemUsage>
</systemUsage>
<!-- The transport connectors ActiveMQ will listen to -->
<transportConnectors>
<!--
<transportConnector name="openwire" uri="tcp://localhost:61616"
discoveryUri="multicast://default"/>
<transportConnector name="ssl" uri="ssl://localhost:61617"/>
<transportConnector name="xmpp" uri="xmpp://localhost:61222"/>
-->
<transportConnector name="stomp" uri="stomp://localhost:61613"/>
</transportConnectors>
</broker>
<!--
** Lets deploy some Enterprise Integration Patterns inside the ActiveMQ
Message Broker
** For more details see
**
** http://activemq.apache.org/enterprise-integration-patterns.html
-->
<camelContext id="camel"
xmlns="http://activemq.apache.org/camel/schema/spring";>
<!-- You can use a <package> element for each root package to search
for Java routes -->
<package>org.foo.bar</package>
<!-- You can use Spring XML syntax to define the routes here using
the <route> element -->
<route>
<from uri="activemq:example.A"/>
<to uri="activemq:example.B"/>
</route>
</camelContext>
<!-- Uncomment to create a command agent to respond to message based
admin commands on the ActiveMQ.Agent topic -->
<!--
<commandAgent xmlns="http://activemq.apache.org/schema/core";
brokerUrl="vm://localhost"/>
-->
<!-- An embedded servlet engine for serving up the Admin console -->
<jetty xmlns="http://mortbay.com/schemas/jetty/1.0";>
<connectors>
<nioConnector port="8161"/>
</connectors>
<handlers>
<webAppContext contextPath="/admin"
resourceBase="${activemq.base}/webapps/admin" logUrlOnStart="true"/>
<webAppContext contextPath="/demo"
resourceBase="${activemq.base}/webapps/demo" logUrlOnStart="true"/>
<webAppContext contextPath="/fileserver"
resourceBase="${activemq.base}/webapps/fileserver" logUrlOnStart="true"/>
</handlers>
</jetty>
<!-- This xbean configuration file supports all the standard spring xml
configuration options -->
<!-- Postgres DataSource Sample Setup -->
<!--
<bean id="postgres-ds" class="org.postgresql.ds.PGPoolingDataSource">
<property name="serverName" value="localhost"/>
<property name="databaseName" value="activemq"/>
<property name="portNumber" value="0"/>
<property name="user" value="activemq"/>
<property name="password" value="activemq"/>
<property name="dataSourceName" value="postgres"/>
<property name="initialConnections" value="1"/>
<property name="maxConnections" value="10"/>
</bean>
-->
<!-- MySql DataSource Sample Setup -->
<!--
<bean id="mysql-ds" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url"
value="jdbc:mysql://localhost/activemq?relaxAutoCommit=true"/>
<property name="username" value="activemq"/>
<property name="password" value="activemq"/>
<property name="maxActive" value="200"/>
<property name="poolPreparedStatements" value="true"/>
</bean>
-->
<!-- Oracle DataSource Sample Setup -->
<!--
<bean id="oracle-ds" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName"
value="oracle.jdbc.driver.OracleDriver"/>
<property name="url" value="jdbc:oracle:thin:@localhost:1521:AMQDB"/>
<property name="username" value="scott"/>
<property name="password" value="tiger"/>
<property name="maxActive" value="200"/>
<property name="poolPreparedStatements" value="true"/>
</bean>
-->
<!-- Embedded Derby DataSource Sample Setup -->
<!--
<bean id="derby-ds" class="org.apache.derby.jdbc.EmbeddedDataSource">
<property name="databaseName" value="derbydb"/>
<property name="createDatabase" value="create"/>
</bean>
-->
</beans>
<!-- END SNIPPET: example -->
Any ideas that anybody has would be appreciated
Thanks
Trey
--
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