Hello,
I just discoveredLogViewPlus and it seems very promising!
I installed an evaluation copy and I'm trying to use it to parse our logs.

I've encountered three issues so far:
1) It seems the automatic pattern parser takes more than 1 log entry into an entry.
Meaning that sometimes entries are incorrectly clumped together.
For example the following 2 entries are detected as 1 entry:
01/06/2019 12:18:52.160 [ERROR] [scr.indexes.CalculateIndexesQueue] (EJB default - 6) [634d4406-0fbd-4936-a332-78314566bfcc] Failed to add algoData (ID: 131) to indexCalculationReadinessQueue: javax.jms.JMSRuntimeException: Could not create a session: IJ000460: Error checking for a transaction
    at org.apache.activemq.artemis.ra.ActiveMQRAConnectionFactoryImpl.createContext(ActiveMQRAConnectionFactoryImpl.java:428)
    at org.apache.activemq.artemis.ra.ActiveMQRAConnectionFactoryImpl.createContext(ActiveMQRAConnectionFactoryImpl.java:410)
    at org.apache.activemq.artemis.ra.ActiveMQRAConnectionFactoryImpl.createContext(ActiveMQRAConnectionFactoryImpl.java:405)
    at scr.utils.Jms.send(Jms.java:80)
    at scr.utils.Jms.Send(Jms.java:29)
    at scr.indexes.CalculateIndexesQueue.EnqueueIfAllowed(CalculateIndexesQueue.java:84)
    at scr.indexes.CalculateIndexesQueue.EnqueueAllIndexes(CalculateIndexesQueue.java:58)
    at scr.init.Scheduler.scheduledCalculateIndexes(Scheduler.java:344)
    at sun.reflect.GeneratedMethodAccessor490.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.jboss.as.ee.component.ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptor.java:52)
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
    at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:57)
    at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:61)
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
    at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:437)
    at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.delegateInterception(Jsr299BindingsInterceptor.java:70)
    at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.doMethodInterception(Jsr299BindingsInterceptor.java:80)
    at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.processInvocation(Jsr299BindingsInterceptor.java:95)
    at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:61)
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
    at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:57)
    at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:61)
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
    at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:437)
    at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:73)
    at org.jboss.as.weld.ejb.EjbRequestScopeActivationInterceptor.processInvocation(EjbRequestScopeActivationInterceptor.java:83)
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
    at org.jboss.as.ee.concurrent.ConcurrentContextInterceptor.processInvocation(ConcurrentContextInterceptor.java:45)
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
    at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:21)
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
    at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
    at org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:52)
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
    at org.jboss.as.ejb3.component.singleton.SingletonComponentInstanceAssociationInterceptor.processInvocation(SingletonComponentInstanceAssociationInterceptor.java:53)
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
    at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:275)
    at org.jboss.as.ejb3.tx.CMTTxInterceptor.required(CMTTxInterceptor.java:327)
    at org.jboss.as.ejb3.tx.CMTTxInterceptor.processInvocation(CMTTxInterceptor.java:239)
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
    at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41)
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
    at org.jboss.as.ejb3.security.SecurityContextInterceptor.processInvocation(SecurityContextInterceptor.java:100)
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
    at org.jboss.as.ejb3.component.interceptors.ShutDownInterceptorFactory$1.processInvocation(ShutDownInterceptorFactory.java:64)
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
    at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50)
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
    at org.jboss.as.ejb3.component.interceptors.AdditionalSetupInterceptor.processInvocation(AdditionalSetupInterceptor.java:54)
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
    at org.jboss.invocation.ContextClassLoaderInterceptor.processInvocation(ContextClassLoaderInterceptor.java:64)
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
    at org.jboss.invocation.InterceptorContext.run(InterceptorContext.java:356)
    at org.wildfly.security.manager.WildFlySecurityManager.doChecked(WildFlySecurityManager.java:636)
    at org.jboss.invocation.AccessCheckingInterceptor.processInvocation(AccessCheckingInterceptor.java:61)
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
    at org.jboss.invocation.InterceptorContext.run(InterceptorContext.java:356)
    at org.jboss.invocation.PrivilegedWithCombinerInterceptor.processInvocation(PrivilegedWithCombinerInterceptor.java:80)
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
    at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
    at org.jboss.as.ejb3.timerservice.TimedObjectInvokerImpl.callTimeout(TimedObjectInvokerImpl.java:104)
    at org.jboss.as.ejb3.timerservice.CalendarTimerTask.invokeBeanMethod(CalendarTimerTask.java:64)
    at org.jboss.as.ejb3.timerservice.CalendarTimerTask.callTimeout(CalendarTimerTask.java:53)
    at org.jboss.as.ejb3.timerservice.TimerTask.retryTimeout(TimerTask.java:208)
    at org.jboss.as.ejb3.timerservice.TimerTask.run(TimerTask.java:163)
    at org.jboss.as.ejb3.timerservice.TimerServiceImpl$Task$1.run(TimerServiceImpl.java:1221)
    at org.wildfly.extension.requestcontroller.RequestController$QueuedTask$1.run(RequestController.java:497)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
    at org.jboss.threads.JBossThread.run(JBossThread.java:320)
Caused by: javax.jms.JMSException: Could not create a session: IJ000460: Error checking for a transaction
    at org.apache.activemq.artemis.ra.ActiveMQRASessionFactoryImpl.allocateConnection(ActiveMQRASessionFactoryImpl.java:895)
    at org.apache.activemq.artemis.ra.ActiveMQRASessionFactoryImpl.createSession(ActiveMQRASessionFactoryImpl.java:520)
    at org.apache.activemq.artemis.ra.ActiveMQRASessionFactoryImpl.createSession(ActiveMQRASessionFactoryImpl.java:734)
    at org.apache.activemq.artemis.ra.ActiveMQRASessionFactoryImpl.createSession(ActiveMQRASessionFactoryImpl.java:739)
    at org.apache.activemq.artemis.ra.ActiveMQRAConnectionFactoryImpl.validateUser(ActiveMQRAConnectionFactoryImpl.java:467)
    at org.apache.activemq.artemis.ra.ActiveMQRAConnectionFactoryImpl.createContext(ActiveMQRAConnectionFactoryImpl.java:420)
    ... 72 more
Caused by: javax.resource.ResourceException: IJ000460: Error checking for a transaction
    at org.jboss.jca.core.connectionmanager.tx.TxConnectionManagerImpl.getManagedConnection(TxConnectionManagerImpl.java:424)
    at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.allocateConnection(AbstractConnectionManager.java:747)
    at org.apache.activemq.artemis.ra.ActiveMQRASessionFactoryImpl.allocateConnection(ActiveMQRASessionFactoryImpl.java:853)
    ... 77 more
Caused by: javax.resource.ResourceException: IJ000459: Transaction is not active: tx=TransactionImple < ac, BasicAction: 0:ffff7f000101:-8ada536:5ceec76e:81d976 status: ActionStatus.ABORTED >
    at org.jboss.jca.core.connectionmanager.tx.TxConnectionManagerImpl.getManagedConnection(TxConnectionManagerImpl.java:408)
    ... 79 more

01/06/2019 12:18:52.363 [INFO ] [scr.reports.engine.ReportCacheManager] (EJB default - 8) [4f135661-a60e-4c4b-b1b4-147a5254c295] Refresh Calculation Cache by Timer: PantingTrendCalculation

I couldn't find a way to solve this.

2) Also using the same example as above, I'd love if the exception will appear in an Exception column. and not in the Message column.

3) Grouping entries is a very powerful feature. However many times messages that should be grouped together still have very small differences. For example messages saying "Attempt number X failed". I'd like those messages grouped even if the attempt number is different.
Is it possible to achieve this?
Perhaps messages can be grouped when the number of differences between them is below some threshold?

Many thanks,
Asaf

Yes - that could definitely be the problem.  As I mentioned, LogViewPlus does not currently support optional fields.

What you could try in this case is a multi-pattern as described here:
https://www.logviewplus.com/docs/pattern_parser.html

Please try the pattern:
%d{dd/MM/yyyy %H:mm:ss.fff} [%p] [%c] (%t) [%s{CorrelationId}] %m%n
%d{dd/MM/yyyy %H:mm:ss.fff} [%p] [%c] (%t) %m%n

Note the lower case 's' on CorrelationId.

Multi-patterns work best when the date field is in a different format, but it is definitely worth trying.

The RegexParser is also worth trying, but unfortunately my regex knowledge is a work in progress.  :-)  I may not be much help in building the correct regex.

Thanks,

Toby

Wonderful, multi pattern seem to have solved the issue!

That's great Asaf - thanks for letting me know!

Toby