Could not open JPA EntityManager for transaction

[TRAPPE Vincent]

Hi, i'm using ubuntu 14.04 LTS, today after an reboot the openmeeting 
application doesnt want to start,

i'm getting since the reboot the following error message :
/ERROR 06-11 20:04:45.090 o.a.o.r.r.ScopeApplicationAdapter:148 
[Launcher:/openmeetings] - [appStart]//
//org.springframework.transaction.CannotCreateTransactionException: 
Could not open JPA EntityManager for transaction; nested exception is 
<openjpa-2.3.0//
//-r422266:1540826 fatal user error> 
org.apache.openjpa.persistence.ArgumentException: The persistence 
provider is attempting to use properties in the p//
//ersistence.xml file to resolve the data source. A Java Database 
Connectivity (JDBC) driver or data source class name must be specified 
in the openjpa.//
//ConnectionDriverName or javax.persistence.jdbc.driver property. The 
following properties are available in the configuration: 
"org.apache.openjpa.jdbc.//
//conf.JDBCConfigurationImpl@442ce698". /

Using version 3.0.5, i've check persistence.xml is correctly in place 
and setup is good

<properties>
                        <property 
name="openjpa.RuntimeUnenhancedClasses" value="unsupported" />
                        <property name="openjpa.ConnectionDriverName" 
value="org.apache.commons.dbcp2.BasicDataSource" />
                        <property name="javax.persistence.jdbc.driver" 
value="com.mysql.jdbc.Driver" />
                        <property name="openjpa.ConnectionProperties"
value="DriverClassName=com.mysql.jdbc.Driver
                                        , 
Url=jdbc:mysql://localhost:3306/openmeetings?autoReconnect=true&amp;useUnicode=true&amp;createDatabaseIfNotExist=true&amp;characterEncoding=utf-8&amp;connectionCollation=utf8_general_ci&amp;cachePrepStmts=true&amp;cacheCallableStatements=true&amp;cacheServerConfiguration=true&amp;useLocalSessionState=true&amp;elideSetAutoCommits=true&amp;alwaysSendSetIsolation=false&amp;enableQueryTimeouts=false&amp;prepStmtCacheSize=3000&amp;prepStmtCacheSqlLimit=1000
                                        , MaxActive=100
                                        , MaxWait=10000
                                        , TestOnBorrow=true
                                        , poolPreparedStatements=true
                                        , Username=root
                                        , Password=xxxx" />
                        <property 
name="openjpa.jdbc.SynchronizeMappings" value="buildSchema" />
                        <property name="openjpa.Log" 
value="DefaultLevel=WARN, Runtime=INFO" />
                        <property name="openjpa.DataCache" value="true" />
                        <!-- QueryCache disabled due to changes outside 
of JPA doesn't take effect with caching -->
                        <property name="openjpa.QueryCache" 
value="false" />
                        <property name="openjpa.jdbc.DBDictionary" 
value="batchLimit=100" />
                        <property name="openjpa.jdbc.QuerySQLCache" 
value="false" />
                </properties>

Was thinking coming from java version Oracle so i've use version openjdk
ava version "1.7.0_79"
OpenJDK Runtime Environment (IcedTea 2.5.5) (7u79-2.5.5-0ubuntu0.12.04.1)
OpenJDK 64-Bit Server VM (build 24.79-b02, mixed mode)
Unfortunaly nothing change.

If someone could help me ....

Vincent