Re: Installation of EPICS archiver on a single Centos7 machine

[Andrea Celentano via Tech-talk <tech-talk at aps.anl.gov>]

Dear Jorn,

thanks. Indeed, I made a mistake and I downloaded the .tar.gz file, not 
the binary .jar file for mysql-connector.

Now everything goes forward, but in the log file "catalina.out" I see 
the following error.

May I ask for an advice?

Thanks

Andrea

2025-02-07 15:59:25,238 FATAL [main] config.DefaultConfigService 
(DefaultConfigService.java:293) - Exception loading the appliance 
properties file
java.lang.NullPointerException: Cannot invoke "java.net.URL.toString()" 
because the return value of "java.lang.ClassLoader.getResource(String)" 
is null
    at 
org.epics.archiverappliance.config.DefaultConfigService.initialize(DefaultConfigService.java:274) 
[classes/:?]
    at 
org.epics.archiverappliance.config.ArchServletContextListener.contextInitialized(ArchServletContextListener.java:47) 
[classes/:?]
    at 
org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4682) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5150) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:713) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:690) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.StandardHost.addChild(StandardHost.java:705) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:978) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1849) 
[catalina.jar:9.0.20]
    at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539) 
[?:?]
    at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
    at 
org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) 
[tomcat-util.jar:9.0.20]
    at 
java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:123) 
[?:?]
    at 
org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:773) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:427) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.startup.HostConfig.start(HostConfig.java:1576) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:309) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:423) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:366) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:929) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367) 
[catalina.jar:9.0.20]
    at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
    at 
org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) 
[tomcat-util.jar:9.0.20]
    at 
java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:145) 
[?:?]
    at 
org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:932) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) 
[catalina.jar:9.0.20]
    at org.apache.catalina.startup.Catalina.start(Catalina.java:633) 
[catalina.jar:9.0.20]
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native 
Method) ~[?:?]
    at 
jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) 
~[?:?]
    at 
jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
~[?:?]
    at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:344) 
[bootstrap.jar:9.0.20]
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native 
Method) ~[?:?]
    at 
jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) 
~[?:?]
    at 
jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
~[?:?]
    at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]
    at 
org.apache.commons.daemon.support.DaemonLoader.start(DaemonLoader.java:241) 
[commons-daemon.jar:1.1.0]
2025-02-07 15:59:25,252 INFO  [main] config.DefaultConfigService 
(DefaultConfigService.java:299) - Using the default key mapping class
2025-02-07 15:59:25,253 FATAL [main] config.ArchServletContextListener 
(ArchServletContextListener.java:50) - Exception initializing config 
service
org.epics.archiverappliance.config.exception.ConfigException: The 
appliance archiver cannot function without knowning the characters that 
separate the components of a PV nam
e
    at 
org.epics.archiverappliance.config.ConvertPVNameToKey.initialize(ConvertPVNameToKey.java:82) 
~[classes/:?]
    at 
org.epics.archiverappliance.config.DefaultConfigService.initialize(DefaultConfigService.java:301) 
~[classes/:?]
    at 
org.epics.archiverappliance.config.ArchServletContextListener.contextInitialized(ArchServletContextListener.java:47) 
[classes/:?]
    at 
org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4682) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5150) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:713) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:690) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.StandardHost.addChild(StandardHost.java:705) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:978) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1849) 
[catalina.jar:9.0.20]
    at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539) 
[?:?]
    at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
    at 
org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) 
[tomcat-util.jar:9.0.20]
    at 
java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:123) 
[?:?]
    at 
org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:773) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:427) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.startup.HostConfig.start(HostConfig.java:1576) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:309) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:423) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:366) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:929) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367) 
[catalina.jar:9.0.20]
    at java.util.concurrent.FutureTask.run(FutureTask.java:264) [?:?]
    at 
org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) 
[tomcat-util.jar:9.0.20]
    at 
java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:145) 
[?:?]
    at 
org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.StandardService.startInternal(StandardService.java:421) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:932) 
[catalina.jar:9.0.20]
    at 
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) 
[catalina.jar:9.0.20]
    at org.apache.catalina.startup.Catalina.start(Catalina.java:633) 
[catalina.jar:9.0.20]
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native 
Method) ~[?:?]
    at 
jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) 
~[?:?]
    at 
jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
~[?:?]
    at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:344) 
[bootstrap.jar:9.0.20]
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native 
Method) ~[?:?]
    at 
jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) 
~[?:?]
    at 
jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
~[?:?]
    at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?]

On 2/7/25 14:58, Jörn Dreyer wrote:
> Hi Andrea,
>
> yes this error is well known. I stumbled across that some years ago when I did my first archiver installation.
> You forgot to download and install the mysql-connector jar file relevant for your mysql version.
> It needs to be placed in the tomcat folder. Check the documentation of the archiver for the exact location.
>   
> Hope this helps,
>
> Jörn
>
> Am Freitag, 7. Februar 2025, 14:50:57 Mitteleuropäische Normalzeit schrieb Andrea Celentano via Tech-talk:
> > Dear colleagues,
> >
> > I am currently developing the slow-controls system for a small-scale
> > experiment (~ 100 PVs), and I'd like to use the EPICS archiver to
> > properly track them.
> >
> > I am using the following setup:
> >
> > * Centos7 machine (I cannot change this at the moment)
> >
> > * Java JDK version 16.0.2
> >
> > * Archiver release 2.0.5
> > (https://urldefense.us/v3/__https://github.com/archiver-appliance/epicsarchiverap/releases/tag/2.0.5__;!!G_uCfscf7eWS!dfP3pgsViV5i5uqOcqz-MWHrFko78Ypy28FydNixfzs_o8UBmRRyBJPjpqZGCwptaFyl7HX0PwxiW6n-WE7VLlepoB0sdgprJNw$ )
> >
> > * Tomcat version apache-tomcat-9.0.20
> >
> > * mysql connector version 5.1.21
> >
> > Following the guide
> > (https://urldefense.us/v3/__https://epicsarchiver.readthedocs.io/en/latest/sysadmin/installguide.html__;!!G_uCfscf7eWS!dfP3pgsViV5i5uqOcqz-MWHrFko78Ypy28FydNixfzs_o8UBmRRyBJPjpqZGCwptaFyl7HX0PwxiW6n-WE7VLlepoB0seOqUtEE$ ),
> > I am using the script "single_machine_install.sh". Everything goes well,
> > I obtain the script "sampleStartup.sh" in the folder where Tomcat
> > Instances are located.
> >
> > If I execute it, and then I open the file "mgmt/logs/catalina.err", I
> > see the following error. and the archiver does not start.
> >
> > ...
> >
> > java.sql.SQLException: Unable to load class: com.mysql.jdbc.Driver from
> > ClassLoader:java.net.URLClassLoader@4617c264;ClassLoader:ParallelWebappClassLoader
> >     context: mgmt
> >     delegate: false
> > ----------> Parent Classloader:
> > java.net.URLClassLoader@4617c264
> >
> >       at
> > org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:292)
> >       at
> > org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:212)
> >       at
> > org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:744)
> >       at
> > org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:676)
> >       at
> > org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:483)
> >       at
> > org.apache.tomcat.jdbc.pool.ConnectionPool.<init>(ConnectionPool.java:154)
> >       at
> > org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:118)
> >       at
> > org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:107)
> >       at
> > org.apache.tomcat.jdbc.pool.DataSourceFactory.createDataSource(DataSourceFactory.java:560)
> >       at
> > org.apache.tomcat.jdbc.pool.DataSourceFactory.getObjectInstance(DataSourceFactory.java:244)
> >       at
> > org.apache.naming.factory.FactoryBase.getObjectInstance(FactoryBase.java:94)
> >       at
> > java.naming/javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:341)
> >       at org.apache.naming.NamingContext.lookup(NamingContext.java:840)
> >       at org.apache.naming.NamingContext.lookup(NamingContext.java:159)
> >       at org.apache.naming.NamingContext.lookup(NamingContext.java:827)
> >       at org.apache.naming.NamingContext.lookup(NamingContext.java:173)
> >       at
> > org.apache.catalina.core.NamingContextListener.addResource(NamingContextListener.java:1017)
> >       at
> > org.apache.catalina.core.NamingContextListener.createNamingContext(NamingContextListener.java:557)
> >       at
> > org.apache.catalina.core.NamingContextListener.lifecycleEvent(NamingContextListener.java:253)
> >       at
> > org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
> >       at
> > org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5048)
> >       at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
> >       at
> > org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:713)
> >       at
> > org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:690)
> >       at
> > org.apache.catalina.core.StandardHost.addChild(StandardHost.java:705)
> >       at
> > org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:978)
> >       at
> > org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1849)
> >       at
> > java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
> >       at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
> >       at
> > org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
> >       at
> > java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:123)
> >       at
> > org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:773)
> >       at
> > org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:427)
> >       at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1576)
> >       at
> > org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:309)
> >       at
> > org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
> >       at
> > org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:423)
> >       at
> > org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:366)
> >       at
> > org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:929)
> >       at
> > org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:841)
> >       at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
> >       at
> > org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1377)
> >       at
> > org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1367)
> >       at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
> >       at
> > org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
> >       at
> > java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:145)
> >       at
> > org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:902)
> >       at
> > org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
> >       at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
> >       at
> > org.apache.catalina.core.StandardService.startInternal(StandardService.java:421)
> >       at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
> >       at
> > org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:932)
> >       at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
> >       at org.apache.catalina.startup.Catalina.start(Catalina.java:633)
> >       at
> > java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
> > Method)
> >       at
> > java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
> >       at
> > java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> >       at java.base/java.lang.reflect.Method.invoke(Method.java:567)
> >       at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:344)
> >       at
> > java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
> > Method)
> >       at
> > java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
> >       at
> > java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> >       at java.base/java.lang.reflect.Method.invoke(Method.java:567)
> >       at
> > org.apache.commons.daemon.support.DaemonLoader.start(DaemonLoader.java:241)
> > Caused by: java.lang.ClassNotFoundException: Unable to load class:
> > com.mysql.jdbc.Driver from
> > ClassLoader:java.net.URLClassLoader@4617c264;ClassLoader:ParallelWebappClassLoader
> > ...
> >
> > Has anyone ever seen this?
> >
> > Thanks,
> >
> > Andrea