Hello,

I am running a sample Hibernate project in Eclipse.
Included with the project are 5 test classes using JUnit.
The first run test classes run with green check mark, but the last one generates the following stack trace:

var account =
----ACCOUNT----
accountId=6
accountType=SAVINGS
creationDate=2011-12-07
balance=1000.0
----ACCOUNT----

var account =
----ACCOUNT----
accountId=7
accountType=SAVINGS
creationDate=2011-12-07
balance=1000.0
----ACCOUNT----

var anotherCopy =
----ACCOUNT----
accountId=7
accountType=SAVINGS
creationDate=2011-12-07
balance=1000.0
----ACCOUNT----

var account =
----ACCOUNT----
accountId=8
accountType=SAVINGS
creationDate=2011-12-07
balance=1000.0
----ACCOUNT----

var anotherCopy = null
var account =
----ACCOUNT----
accountId=9
accountType=SAVINGS
creationDate=2011-12-07
balance=1000.0
----ACCOUNT----

var anotherCopy =
----ACCOUNT----
accountId=9
accountType=SAVINGS
creationDate=2011-12-07
balance=1000.0
----ACCOUNT----

var account =
----ACCOUNT----
accountId=10
accountType=SAVINGS
creationDate=2011-12-07
balance=1000.0
----ACCOUNT----

java.sql.SQLException: Listener refused the connection with the following error:
ORA-12519, TNS:no appropriate service handler found
The Connection descriptor used by the client was:
localhost:1521:XE

at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:261)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:387)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:414)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:165)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at courses.hibernate.dao.OracleAccountDAO.getConnection(OracleAccountDAO.java:67)
at courses.hibernate.dao.AccountDAO.updateAccount(AccountDAO.java:42)
at courses.hibernate.service.AccountService.updateAccount(AccountService.java:52)
at courses.hibernate.service.OracleAccountServiceTest.testUpdateAccountBalance(OracleAccountServiceTest.java:134)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

Suggestions as to what could be the problem ?

Paolo