About concurrency

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PersistenceException UserException: Failed to validate persistence.xml

) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java
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Problem upgrading

.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_72] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_72] at org.apache
Issue
1

Server crash - Mismatch client-server protocol prefix

.java:307) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603
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Spring Data JPA

$SocketProcessor.run(JIoEndpoint.java:309) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor
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Spring LTW Problem

) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread
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use of Singleton into tomcat

the concurrency for the operations on db............... with a method static i can get the only instance ... it call the methods on mode concurrent????? write me a example . i wait for a response. tank you mauro
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UserException - Object User#2 belongs to another EntityManager

) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java
Result
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ObjectDB version 2.2.5

entity object. Fixed merging entity objects of another EntityManager. Fixed a bug in concurrent
Result
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ObjectDB version 2.6.2

#1635). Fixed a NullPointerException on concurrent access of first object of an entity class. Fixed
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ObjectDB version 2.7.2

for possibly improved concurrent database file access. Added automatic logging of query details