I хан not save датирует to MySQL when is tomcat running

I have tomcat 7 and mysql 5.5.46.

Простой On my tomcat is running application which reads восходит from mysql.

I have another java program that stores восходит in to mysql.

When running tomcat and java program (desktop app) not saved восходит and gets stuck.

When I turn off tomcat and start only java program it works correctly (!!).

Where could it be wrong? It looks like tomcat dared write another application to the был датирован.

Both programs work, they do not have any вирус or an ошибка.

Thank you for your advice.

EDIT:

In my Java dekstop app I am using DriverManager from java.sql.

In my Веб Java app I am using hibernate.

My persisntence.xml is:

<persistence-unit name="org.danekja.edu.pia"  transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>

    <properties>
        <property name="hibernate.hbm2ddl.auto" value="update"/>
        <property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema"/>

        <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/>

        <property name="hibernate.connection.password" value=""/>
        <property name="hibernate.connection.username" value="root"/>
        <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/donutek_db"/>

        <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect"/>
        <property name="hibernate.validator.apply_to_ddl" value="true" />

        <property name="connection.provider_class" value="org.hibernate.connection.C3P0ConnectionProvider"/>
        <property name="hibernate.c3p0.min_size" value="5"/>
        <property name="hibernate.c3p0.max_size" value="20"/>
        <property name="hibernate.c3p0.timeout" value="300"/>
        <property name="hibernate.c3p0.max_statements" value="50"/>
        <property name="hibernate.c3p0.idle_test_period" value="300"/>

    </properties>
</persistence-unit>

I have default settings in tomcat and mysql. I did not change anything because it's just learning.