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Esper is a component for CEP and ESP applications, available for Java as Esper, and for .NET as NEsper.

Esper and NEsper enable rapid development of applications that process large volumes of incoming messages or events. Esper and NEsper filter and analyze events in various ways, and respond to conditions of interest in real-time.

Esper and NEsper were designed to make it easier to build CEP and ESP applications. Esper and NEsper are open-source software available under the GNU General Public License (GPL) license.
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Thread (1002 Threads) Rating Replies Last Message Child Forum

[jira] Created: (ESPER-405) Equals operator on object types in expressions should support inheritance by JIRA jira@codehaus.o...
10
by JIRA jira@codehaus.o...

[jira] Created: (ESPER-404) Statement resources not cleaned up after statement destroy by JIRA jira@codehaus.o...
12
by JIRA jira@codehaus.o...

[jira] Created: (ESPER-415) statement object model fails on every-distinct by JIRA jira@codehaus.o...
2
by JIRA jira@codehaus.o...

Variations in Pattern Matching based on delay between events. by johnyabb
5
by Thomas Bernhardt

Novice Question - Rstream from a Named Window by Parsh Wanath-2
1
by Thomas Bernhardt

.getAccessors Unable to obtain CGLib fast method implementation by Anshul J
1
by Thomas Bernhardt

[jira] Created: (ESPER-421) Case-when throws NullPointerException when condition returns null by JIRA jira@codehaus.o...
0
by JIRA jira@codehaus.o...

Nullpointerexception with query by benjamine.leon
1
by Thomas Bernhardt

Memory leak in Left outer joins of two streams, when left stream is null by rajim17
1
by Thomas Bernhardt

price pattern by luri ron
2
by Thomas Bernhardt

Esper - Get best bid price from multiple price feeds by riverp
1
by Thomas Bernhardt

Filtering out duplicate events by Dimitrios Kolovos
2
by Thomas Bernhardt

Restrictions in XML Representations...? by Emmanuel Mulo
1
by Thomas Bernhardt

[jira] Created: (ESPER-420) Group-by with wildcard-select may present wrong value for non-aggregated and non-grouped properties by JIRA jira@codehaus.o...
0
by JIRA jira@codehaus.o...

output throttle issue by benjamine.leon
12
by Thomas Bernhardt

[jira] Created: (ESPER-419) Group-by with "output last" output rate limiting and wildcard select outputs last event and not last event per group by JIRA jira@codehaus.o...
1
by JIRA jira@codehaus.o...

Esper at Open Source in Finance eXchange conference by Thomas Bernhardt
0
by Thomas Bernhardt

Stream Name Issue by sdicocco
1
by Thomas Bernhardt

[jira] Created: (ESPER-418) Statement fails to compile if the statement only has a where-clause and uses an alias by JIRA jira@codehaus.o...
3
by JIRA jira@codehaus.o...

[jira] Created: (ESPER-417) support annotations in statement object model by JIRA jira@codehaus.o...
1
by JIRA jira@codehaus.o...

[jira] Created: (ESPER-416) statement name provided by API does not overrides annotation provided name by JIRA jira@codehaus.o...
1
by JIRA jira@codehaus.o...

Update event property by benjamine.leon
8
by Thomas Bernhardt

Esper correlation based on dynamic events by Anoop_123
3
by Thomas Bernhardt

Counting events between other events by nebulo-2
1
by Thomas Bernhardt

[jira] Created: (ESPER-414) In some scenarion, createEPL fails with IllegalStateException vs EPException by JIRA jira@codehaus.o...
1
by JIRA jira@codehaus.o...

Events sent from updateListener using route() lost by benjamine.leon
2
by Thomas Bernhardt

[jira] Created: (ESPER-413) Please add sources jars for Esper in Maven repository by JIRA jira@codehaus.o...
0
by JIRA jira@codehaus.o...

Esper EPRuntime java.lang.NullPointerException by Sandeep Poreddy
3
by Alexandre Vasseur

[jira] Created: (ESPER-412) Out of memory while using group by by JIRA jira@codehaus.o...
2
by JIRA jira@codehaus.o...

[jira] Created: (ESPER-409) Order-by clause not applied when pattern delivers multiple result row for single incoming event by JIRA jira@codehaus.o...
4
by JIRA jira@codehaus.o...

Query Syntax question by sdicocco
0
by sdicocco

[jira] Created: (ESPER-411) Operands of expression passed the wrong way round in patterns by JIRA jira@codehaus.o...
0
by JIRA jira@codehaus.o...

[jira] Created: (ESPER-410) Support for {n} repetition of regex in match_recognize by JIRA jira@codehaus.o...
0
by JIRA jira@codehaus.o...

What is the recommended way to query the state of EPRuntime for pending events by developer1.mail@gmai...
0
by developer1.mail@gmai...

[jira] Created: (ESPER-408) Support multiple crontab schedules in output rate limiting or support pattern in output rate limiting by JIRA jira@codehaus.o...
0
by JIRA jira@codehaus.o...
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