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springboot Unable to acquire JDBC Connection when deployed with gitlab ci

My spring application is throwing this error, when I deploy it using gitlab ci.
Caused by: org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection
It works fine when I deploy the same container manually. But the error occurs only when app is deployed via gitlab ci.
I've define pool size, in application.properites file.
spring.datasource.hikari.minimumIdle=20
spring.datasource.hikari.maximumPoolSize=30
spring.datasource.hikari.connectionTimeout=50000
I dont how else can I troubleshoot this issue.
more log.
20:00:47.418 [http-nio-8098-exec-10] WARN o.h.e.jdbc.spi.SqlExceptionHelper - SQL Error: 0, SQLState: null
20:00:47.419 [http-nio-8098-exec-10] ERROR o.h.e.jdbc.spi.SqlExceptionHelper - HikariPool-1 - Connection is not available, request timed out after 30481ms.
20:00:47.452 [http-nio-8098-exec-10] WARN g.e.SimpleDataFetcherExceptionHandler - Exception while fetching data (/getCodes) : Could not open JPA EntityManager for transaction; nested exception is org.hiberna
te.exception.JDBCConnectionException: Unable to acquire JDBC Connection org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Conne
ction
at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:467) ~[spring-orm-5.3.7.jar!/:5.3.7]
at org.springframework.transaction.support.AbstractPlatformTransactionManager.startTransaction(AbstractPlatformTransactionManager.java:400) ~[spring-tx-5.3.7.jar!/:5.3.7]
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:373) ~[spring-tx-5.3.7.jar!/:5.3.7]
at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:595) ~[spring-tx-5.3.7.jar!/:5.3.7]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:382) ~[spring-tx-5.3.7.jar!/:5.3.7]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-5.3.7.jar!/:5.3.7]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.7.jar!/:5.3.7]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:750) ~[spring-aop-5.3.7.jar!/:5.3.7]
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:692) ~[spring-aop-5.3.7.jar!/:5.3.7]
at com.idg.idgcore.pricing.app.service.priceCode.PriceCodeApplicationService$$EnhancerBySpringCGLIB$$936d76c1.getAll(<generated>) ~[classes!/:na]
at jdk.internal.reflect.GeneratedMethodAccessor172.invoke(Unknown Source) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
at io.leangen.graphql.metadata.execution.SingletonMethodInvoker.execute(SingletonMethodInvoker.java:21) ~[spqr-0.9.9.jar!/:na]

Handle database down in Spring Boot

I would like to test on my system if the database is down with Spring Boot. I have written a rest call for testing. When the database is up, it return "test" which is correct result. But the database is down, it return nothing.
The Goal is to make it to return "test" even the database is down. Below is the error
2020-04-27 17:27:00.003 ERROR 9536 [] --- [pool-1-thread-1] o.s.s.s.TaskUtils$LoggingErrorHandler : Unexpected error occurred in scheduled task.
org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection
at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:450)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:378)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:137)
at org.springframework.session.jdbc.JdbcOperationsSessionRepository.cleanUpExpiredSessions(JdbcOperationsSessionRepository.java:589)
at org.springframework.session.jdbc.config.annotation.web.http.JdbcHttpSessionConfiguration.lambda$configureTasks$0(JdbcHttpSessionConfiguration.java:194)
at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:93)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection
at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:48)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:111)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:97)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.acquireConnectionIfNeeded(LogicalConnectionManagedImpl.java:109)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.getPhysicalConnection(LogicalConnectionManagedImpl.java:136)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.getConnectionForTransactionManagement(LogicalConnectionManagedImpl.java:254)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.begin(LogicalConnectionManagedImpl.java:262)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.begin(JdbcResourceLocalTransactionCoordinatorImpl.java:214)
at org.hibernate.engine.transaction.internal.TransactionImpl.begin(TransactionImpl.java:56)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.beginTransaction(HibernateJpaDialect.java:162)
at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:400)
... 13 common frames omitted
Caused by: java.sql.SQLTransientConnectionException: HikariCP - Connection is not available, request timed out after 60000ms.
at com.zaxxer.hikari.pool.HikariPool.createTimeoutException(HikariPool.java:669)
at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:183)
at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:148)
at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:128)
at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122)
at org.hibernate.internal.NonContextualJdbcConnectionAccess.obtainConnection(NonContextualJdbcConnectionAccess.java:35)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.acquireConnectionIfNeeded(LogicalConnectionManagedImpl.java:106)
... 20 common frames omitted
Caused by: org.postgresql.util.PSQLException: Connection to X:X:X:X:xxxx refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:280)
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49)
at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:195)
at org.postgresql.Driver.makeConnection(Driver.java:454)
at org.postgresql.Driver.connect(Driver.java:256)
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:117)
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:123)
at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:365)
at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:194)
at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:460)
at com.zaxxer.hikari.pool.HikariPool.access$100(HikariPool.java:71)
at com.zaxxer.hikari.pool.HikariPool$PoolEntryCreator.call(HikariPool.java:699)
at com.zaxxer.hikari.pool.HikariPool$PoolEntryCreator.call(HikariPool.java:685)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
... 3 common frames omitted
Caused by: java.net.ConnectException: Connection refused (Connection refused)
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.postgresql.core.PGStream.<init>(PGStream.java:70)
at org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect(ConnectionFactoryImpl.java:91)
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:192)
... 16 common frames omitted
And the test controller is in below
#RestController
public class TestController {
#GetMapping(value = "/test")
public String test() {
System.out.println("test");
return "Test";
}
}
the application.properties is like below
spring.datasource.hikari.maximumPoolSize=10
spring.datasource.hikari.idleTimeout=50000
spring.datasource.hikari.maxLifetime=2000000
spring.datasource.hikari.connectionTimeout=60000
spring.datasource.continue-on-error=true
spring.datasource.initialization-mode=never
spring.datasource.hikari.pool-name=KlmsHikariCP
spring.datasource.hikari.connection-test-query=SELECT 1
spring.datasource.hikari.initialization-fail-timeout= -1
spring.datasource.hikari.isolate-internal-queries=true
spring.datasource.hikari.allow-pool-suspension=true
spring.datasource.test-while-idle=true
spring.datasource.test-on-borrow=true
spring.datasource.test-on-return=false
spring.datasource.validation-interval=40000
spring.datasource.validation-query=SELECT 1 FROM DUAL
spring.datasource.time-between-eviction-runs-millis=5000
spring.datasource.min-evictable-idle-time-millis=5000
spring.datasource.remove-abandoned=true
spring.datasource.remove-abandoned-timeout=3
spring.datasource.log-abandoned=true
spring.datasource.log-validation-errors=true
################### Hibernate Configuration ##########################
spring.jpa.hibernate.ddl-auto=none
spring.jpa.show-sql=false
spring.jpa.properties.hibernate.temp.use_jdbc_metadata_defaults=true
spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect

Do you mean during the startup of Spring or while the application is running?
Your RestController currently does not access the DB so I fail to see how the DB connection could result in errors and if the DB is down the controller should return "Test".
If you mean during startup you can try:
spring.datasource.continue-on-error=true

Check that the hostname and port are correct and that the postmaster
is accepting TCP/IP connections.
Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.

Cause of error if Caused by: org.postgresql.util.PSQLException: Connection to X:X:X:X:xxxx refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
Please make sure the database host and port in your application.properties file are mentioned and are correct and also the database instance is up and running in mentioned host.

tomcat server getting hanged randomly(no logs come) and after Ctrl+c it starts working and even logs atart coming

I have deployed my application on tomcat server, but randomly my server stops giving the logs and intermittently the application hangs but after doing Ctrl+c the logs again start coming and application starts working. The logs are as:
2017-04-13 12:50:42,711 [http-nio-8080-exec-12] WARN org.hibernate.engine.jdbc.spi.SqlExceptionHelper - SQL Error: 17002, SQLState: 08006
2017-04-13 12:50:42,711 WARN - SqlExceptionHelper - SQL Error: 17002, SQLState: 08006
2017-04-13 12:50:42,711 [http-nio-8080-exec-12] ERROR org.hibernate.engine.jdbc.spi.SqlExceptionHelper - IO Error: Socket read timed out
2017-04-13 12:50:42,711 ERROR - SqlExceptionHelper - IO Error: Socket read timed out
2017-04-13 12:50:42,711 [http-nio-8080-exec-12] ERROR org.springframework.transaction.interceptor.TransactionInterceptor - Application exception overridden by rollback exception
org.springframework.dao.DataAccessResourceFailureException: could not extract ResultSet; nested exception is org.hibernate.exception.JDBCConnectionException: could not extract ResultSet
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:257)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:244)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:491)
at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59)
at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:147)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
at com.sun.proxy.$Proxy112.list(Unknown Source)
at com.parkwaypantai.spos.backend.common.service.impl.ClinicUserServiceImpl.list(ClinicUserServiceImpl.java:96)
Caused by: org.hibernate.exception.JDBCConnectionException: could not extract ResultSet
at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:115)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:111)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:97)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:79)
at org.hibernate.loader.Loader.getResultSet(Loader.java:2123)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1911)
Caused by: java.sql.SQLRecoverableException: IO Error: Socket read timed out
at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:899)
at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1175)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1296)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3613)
at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3657)
Caused by: oracle.net.ns.NetException: Socket read timed out
at oracle.net.ns.Packet.receive(Packet.java:347)
at oracle.net.ns.DataPacket.receive(DataPacket.java:106)
at oracle.net.ns.NetInputStream.getNextPacket(NetInputStream.java:324)
at oracle.net.ns.NetInputStream.read(NetInputStream.java:268)
at oracle.net.ns.NetInputStream.read(NetInputStream.java:190)
I tried getting the thread dumps also but as the server hangs so not even dumps are coming for that point of time...Please help me as I have got stuck in this case...Thanks in advance...

IJ000305: Connection error occured: org.jboss.jca.core.connectionmanager.listener.TxConnectionListener

We are using Wildfly8.2 server. The DB connection pool managed by Wildfly server is not able to reconnect (or to regenerate a valid/managed connection pool) after the connections are invalidated by the database server.
Please see the below error:
2016-05-03 11:35:43,662 WARN [org.jboss.jca.core.connectionmanager.listener.TxConnectionListener] (NRG) IJ000305: Connection error occured: org.jboss.jca.core.connectionmanager.listener.TxConnectionListener#231fd521[state=NORMAL managed connection=org.jboss.jca.adapters.jdbc.local.LocalManagedConnection#7ea688d0 connection handles=1 lastUse=1462286812044 trackByTx=false pool=org.jboss.jca.core.connectionmanager.pool.strategy.OnePool#794f665c mcp=SemaphoreArrayListManagedConnectionPool#43e70a99[pool=DSNAME] xaResource=LocalXAResourceImpl#7482a7a7[connectionListener=231fd521 connectionManager=3d2232ff warned=false currentXid=null productName=Oracle productVersion=Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing options jndiName=java:jboss/DSNAME] txSync=null]: javax.resource.spi.ResourceAdapterInternalException: Unexpected error<br>
at org.jboss.jca.adapters.jdbc.BaseWrapperManagedConnection.broadcastConnectionError(BaseWrapperManagedConnection.java:644)<br>
at org.jboss.jca.adapters.jdbc.BaseWrapperManagedConnection.connectionError(BaseWrapperManagedConnection.java:610)<br>
at org.jboss.jca.adapters.jdbc.WrappedConnection.checkException(WrappedConnection.java:1640)
at org.jboss.jca.adapters.jdbc.WrappedStatement.checkException(WrappedStatement.java:1267)<br>
at org.jboss.jca.adapters.jdbc.WrappedPreparedStatement.executeQuery(WrappedPreparedStatement.java:467)
at com.abc.app.beans.ReconcileInfo.getNextMessage(ReconcileInfo.java:412) [classes:]
at com.abc.app.beans.GroupInfo.sendMessage(GroupInfo.java:819) [classes:]<br>
at com.abc.app.app.GroupSendThread.send(GroupSendThread.java:112) <br>[classes:]
at com.ctsu.rdts.app.GroupSendThread.run(GroupSendThread.java:66) [classes:]
Caused by: java.lang.ThreadDeath<br>
at java.lang.Thread.stop(Thread.java:850) [rt.jar:1.8.0_31]
at com.abc.app.app.HttpDequeue.stopThread(HttpDequeue.java:876) [classes:]
at com.abc.app.app.HttpDequeue.clearLocks(HttpDequeue.java:397) [classes:]
at com.abc.app.app.HttpDequeue.run(HttpDequeue.java:383) [classes:]

How to start derby server from within my java application

i have been working with EclipseLink of recent and after creating my java application, without me starting the derby server manually from netbeans (Services>Databases>JavaDB> Start Server) my application will not be able to connect to the database, i don't know what is wrong or how to go about this. i used this code from a new thread and this is what i get.
public static class DBServerStarter extends Thread {
NetworkServerControl serverControl;
public DBServerStarter(){
try {
serverControl = new NetworkServerControl();
} catch (Exception ex) {
Logger.getLogger(ContactManager.class.getName()).log(Level.SEVERE, null, ex);
}
}
#Override
public void run(){
try {
serverControl.start(new PrintWriter(System.out));
} catch (Exception ex) {
Logger.getLogger(ContactManager.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
and my log look like
Tue Mar 25 12:50:33 WAT 2014 : Apache Derby Network Server - 10.9.1.0 - (1344872) started and ready to accept connections on port 1527
[EL Info]: 2014-03-25 12:50:36.098--ServerSession(21798543)--EclipseLink, version: Eclipse Persistence Services - 2.5.1.v20130918-f2b9fc5
[EL Severe]: ejb: 2014-03-25 12:50:36.583--ServerSession(21798543)--Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.1.v20130918-f2b9fc5): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLNonTransientConnectionException: The connection was refused because the database Contact was not found.
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.prodigy4440.contactmanager.ContactManager.main(ContactManager.java:28)
Error Code: 40000
Caused by: javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.1.v20130918-f2b9fc5): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLNonTransientConnectionException: The connection was refused because the database Contact was not found.
Error Code: 40000
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:766)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getAbstractSession(EntityManagerFactoryDelegate.java:204)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getDatabaseSession(EntityManagerFactoryDelegate.java:182)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getDatabaseSession(EntityManagerFactoryImpl.java:527)
at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactoryImpl(PersistenceProvider.java:140)
at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:177)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:79)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
at com.prodigy4440.contactmanager.MainJFrame.<clinit>(MainJFrame.java:38)
... 1 more
Caused by: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.1.v20130918-f2b9fc5): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLNonTransientConnectionException: The connection was refused because the database Contact was not found.
Error Code: 40000
at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:331)
at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:326)
at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:138)
at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162)
at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.setOrDetectDatasource(DatabaseSessionImpl.java:204)
at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:741)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:239)
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:685)
... 9 more
Caused by: java.sql.SQLNonTransientConnectionException: The connection was refused because the database Contact was not found.
at org.apache.derby.client.am.SQLExceptionFactory40.getSQLException(Unknown Source)
at org.apache.derby.client.am.SqlException.getSQLException(Unknown Source)
at org.apache.derby.jdbc.ClientDriver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(DriverManager.java:571)
at java.sql.DriverManager.getConnection(DriverManager.java:187)
at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:98)
... 14 more
Caused by: org.apache.derby.client.am.DisconnectException: The connection was refused because the database Contact was not found.
at org.apache.derby.client.net.NetConnectionReply.parseRDBNFNRM(Unknown Source)
at org.apache.derby.client.net.NetConnectionReply.parseAccessRdbError(Unknown Source)
at org.apache.derby.client.net.NetConnectionReply.parseACCRDBreply(Unknown Source)
at org.apache.derby.client.net.NetConnectionReply.readAccessDatabase(Unknown Source)
at org.apache.derby.client.net.NetConnection.readSecurityCheckAndAccessRdb(Unknown Source)
at org.apache.derby.client.net.NetConnection.flowSecurityCheckAndAccessRdb(Unknown Source)
at org.apache.derby.client.net.NetConnection.flowUSRIDPWDconnect(Unknown Source)
at org.apache.derby.client.net.NetConnection.flowConnect(Unknown Source)
at org.apache.derby.client.net.NetConnection.<init>(Unknown Source)
at org.apache.derby.client.net.NetConnection40.<init>(Unknown Source)
at org.apache.derby.client.net.ClientJDBCObjectFactoryImpl40.newNetConnection(Unknown Source)
... 18 more
Java Result: 1
BUILD SUCCESSFUL (total time: 5 seconds)

The answer is in the log message:
java.sql.SQLNonTransientConnectionException: The connection was
refused because the database Contact was not found.
So you need to manually create Contact database or add create=true to javax.persistence.jdbc.url property in your persistence.xml:
<property name="javax.persistence.jdbc.url" value="jdbc:derby:/path/to/db/Contact;create=true" />
It allows derby to create database if it doesn't exist.