Develop Reference

How to use SSL encryption when connecting Vaadin App with Hibernate to MariaDB on Azure

I am currently working on a Java 8 app with Vaadin and Hibernate which I am trying to migrate to Azure for testing purposes.
Everything worked out so far except for one thing:
When I activate the require SSL option in The MariaDB on Azure, I can't connect anymore:
Caused by: java.sql.SQLException: SSL connection is required. Please specify SSL options and retry.
Unfortunately I didn't write this app myself and I am not too familiar with neither Vaadin nor Hibernate or even Java in general and how to establish ssl or db connections with those.So I need some help:
This is the JDBC Connection string in the Servlet.java file, where for my understanding the db init happens:
Connection con = DriverManager.getConnection("jdbc:mysql://<username>.mariadb.database.azure.com:3306/<db>?autoReconnect=true", "<username>", "<password>");
which I changed by just adding this to the URL: &useSSL=true&requireSSL=true&verifyServerCertificate=true
Now the app doesn't stop at the DB init anymore but still crashes before the page is fully rendered, with the same error message.
I found a hibernate.cfg.xml with the following content (I removed the mappings to keep it shorter):
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Hibernate -->
<property name="hibernate.use_sql_comments">true</property>
<property name="hibernate.format_sql">true</property>
<property name="hibernate.show_sql">false</property>
<property name="hibernate.connection.autocommit">true</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>
<!-- Hikari -->
<property name="hibernate.connection.provider_class">com.zaxxer.hikari.hibernate.HikariConnectionProvider</property>
<property name="hibernate.hikari.dataSourceClassName">com.mysql.jdbc.jdbc2.optional.MysqlDataSource</property>
<property name="hibernate.hikari.dataSource.url">jdbc:mysql://dbname.mariadb.database.azure.com:3306/db</property>
<property name="hibernate.hikari.dataSource.user">username</property>
<property name="hibernate.hikari.dataSource.password">password</property>
<property name="hibernate.hikari.dataSource.cachePrepStmts">true</property>
<property name="hibernate.hikari.dataSource.prepStmtCacheSize">250</property>
<property name="hibernate.hikari.dataSource.prepStmtCacheSqlLimit">2048</property>
<property name="hibernate.hikari.dataSource.useServerPrepStmts">true</property>
</session-factory>
</hibernate-configuration>
What do I have to change there to make use of SSL for the connection?

You may try:
<property name="hibernate.hikari.dataSource.url">jdbc:mysql://dbname.mariadb.database.azure.com:3306/db?useSSL=true</property>
Per my understanding, the properties in hibernate.cfg.xml will finally be used to generate a whole connection string. So, if there is no direct property for useSSL, you may add it to the url manually.

I'm getting XMLStreamException at [row,col]:[1,2]

I suddenly have started getting XMLStreamException in my project. Yesterday it worked just fine, today I made some minor changes and it's broken. I tried to rebase to previous versions, but nothing changed at all.
Here is my xml file:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
<property name="hibernate.connection.url">jdbc:postgresql://localhost:5433/logistica</property>
<property name="hibernate.connection.username">testUser</property>
<property name="hibernate.connection.password">pass</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.dialect">org.hibernate.dialect.PostgreSQL9Dialect</property>
<mapping class="com.log.iei.logistica.data.entities.ClientEntity" />
<mapping class="com.log.iei.logistica.data.entities.ContractEntity" />
<mapping class="com.log.iei.logistica.data.entities.ContainerEntity" />
<mapping class="com.log.iei.logistica.data.entities.VehicleEntity" />
<mapping class="com.log.iei.logistica.data.entities.TransactionEntity" />
</session-factory>
</hibernate-configuration>
And exception:
org.hibernate.HibernateException: Error accessing stax stream
at org.hibernate.boot.cfgxml.internal.JaxbCfgProcessor.unmarshal(JaxbCfgProcessor.java:107)
at org.hibernate.boot.cfgxml.internal.JaxbCfgProcessor.unmarshal(JaxbCfgProcessor.java:65)
at org.hibernate.boot.cfgxml.internal.ConfigLoader.loadConfigXmlResource(ConfigLoader.java:57)
at org.hibernate.boot.registry.StandardServiceRegistryBuilder.configure(StandardServiceRegistryBuilder.java:165)
at org.hibernate.cfg.Configuration.configure(Configuration.java:258)
at org.hibernate.cfg.Configuration.configure(Configuration.java:244)
at com.log.iei.logistica.managers.HibernateSessionManager.getSessionFactory(HibernateSessionManager.java:18)
at com.log.iei.logistica.data.controllers.Services.GenericDao.getSession(GenericDao.java:78)
at com.log.iei.logistica.data.controllers.Services.GenericDao.findAll(GenericDao.java:58)
at com.log.iei.logistica.data.controllers.Services.VehicleService.findAll(VehicleService.java:50)
at com.log.iei.logistica.gui.cargo.CargoPage.init(CargoPage.java:27)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
.........
.......
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,2]
Message: The markup declarations contained or pointed to by the document type declaration must be well-formed.
at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(XMLStreamReaderImpl.java:604)
at com.sun.xml.internal.stream.XMLEventReaderImpl.peek(XMLEventReaderImpl.java:276)
at org.hibernate.boot.cfgxml.internal.JaxbCfgProcessor.unmarshal(JaxbCfgProcessor.java:103)
... 36 more

I began having the same issue. I hadn't updated anything, but restarting tomcat failed with lots of new exceptions. I noticed the below file was updated today and wondered if it was the source (it is referenced in each of my entity mappings):
http://hibernate.org/dtd/hibernate-mapping-3.0.dtd
So I updated my mappings to use the DTD from here:"hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" - and that works. So it does appear to be caused by the Hibernate's updated DTD file.
I guess your options are:
figure out what hibernate wants in the updated dtd
use the dtd from another source like sourceforge
use the dtd from your hibernate jar like this: "classpath://org/hibernate/hibernate-mapping-3.0.dtd"

How to connect to Oracle 12c PDB using Hibernate

I have created a sample Oracle 12c PDB (Pluggable Data Base) using the instructions from here. How do I connect to this pluggable database using Hibernate application? I am using a sample Hibernate application from here
I changed the hibernate.cfg.xml file as follows:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.url">jdbc:oracle:thin:#localhost:1521:sys</property>
<property name="connection.username">sys as sysdba</property>
<property name="connection.password">helloWORLD12</property>
<property name="connection.driver_class">oracle.jdbc.OracleDriver</property>
<property name="dialect">org.hibernate.dialect.Oracle12cDialect</property>
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<property name="hbm2ddl.auto">create</property>
<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>
<property name="current_session_context_class">thread</property>
<mapping class="net.codejava.hibernate.Book" />
</session-factory>
</hibernate-configuration>
But I am getting the following error trace when I run the program:
Exception in thread "main" org.hibernate.HibernateException: Error accessing stax stream
at org.hibernate.boot.cfgxml.internal.JaxbCfgProcessor.unmarshal(JaxbCfgProcessor.java:107)
at org.hibernate.boot.cfgxml.internal.JaxbCfgProcessor.unmarshal(JaxbCfgProcessor.java:65)
at org.hibernate.boot.cfgxml.internal.ConfigLoader.loadConfigXmlResource(ConfigLoader.java:57)
at org.hibernate.boot.registry.StandardServiceRegistryBuilder.configure(StandardServiceRegistryBuilder.java:163)
at net.codejava.hibernate.BookManager.setup(BookManager.java:23)
at net.codejava.hibernate.BookManager.main(BookManager.java:100)
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[18,6]
Message: The processing instruction target matching "[xX][mM][lL]" is not allowed.
at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(XMLStreamReaderImpl.java:604)
at com.sun.xml.internal.stream.XMLEventReaderImpl.peek(XMLEventReaderImpl.java:276)
at org.hibernate.boot.cfgxml.internal.JaxbCfgProcessor.unmarshal(JaxbCfgProcessor.java:103)
... 5 more
Kindly let me know where I am going wrong. There are almost no resources online for using Oracle 12c PDB with Hibernate.
UPDATE 1: I had an extra line of XML code in my config file which lead to the XML parsing error. Now - how do I associate a CDB/PDB with a particular user account, since using the PDB through SYS user is not recommended.
I have a PDB named 'pdb1', and it is associated with sys user account. It is stored at the following location:
D:\app\myusername\virtual\oradata\orcl\pdb1
I created a new user 'c##test' and then created a pdb while logged in to the user 'c##test' using the following command:
create pluggable database pdb3 admin user pdb_admin3 identified by helloWORLD12
file_name_convert=('D:\app\myusername\virtual\oradata\orcl\pdbseed\',
'D:\app\myusername\virtual\oradata\test\pdb3\');
'pdb3' is created successfully, but it is not getting associated to the user 'c##test'.
The error trace I am getting now is as follows: https://pastebin.com/skVMLkqT

The issue is with the syntax you are using. you are using :SID instead of /SERVICE_NAME , so make sure to change this line as :
<property name="connection.url">jdbc:oracle:thin:#localhost:1521/sys</property>
to see which services available, execute lsnrctl service.
Please also note that you are trying to use sys account which is a the
same as root. to avoid future problems, it's best practice to create a
new account an use that instead.
according to your stack trace you missed oracle driver dependency:
ClassNotFoundException: Could not load requested class :
oracle.jdbc.OracleDriver
you should add this dependecy to your pom.xml file,Please take these steps for that:
1- Download ojdbc8.jar from oracle site:
https://www.oracle.com/technetwork/database/features/jdbc/jdbc-ucp-122-3110062.html
2- Install ojdbc8 to your local maven repository:
specify you path instead of Path/to/your/
mvn install:install-file -Dfile={Path/to/your/ojdbc8.jar} DgroupId=com.oracle -DartifactId=ojdbc8 -Dversion=12.2.0.1 -Dpackaging=jar
3-Add Dependency to Pom.xml
<!-- ORACLE database driver -->
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc8</artifactId>
<version>12.2.0.1</version>
</dependency>

Netbeans 8.x + hibernate + postgreSQL : No tables found in reverse engineering

I use neatbeans with hibernate + postgreSQL.
In postgreSQL I have 1 table : "test" with 3 columns.
I created the hibernate.cfg.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
<property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
<property name="hibernate.connection.url">jdbc:postgresql://localhost:5432/test</property>
<property name="hibernate.connection.username">postgres</property>
<property name="hibernate.connection.password">root</property>
</session-factory>
</hibernate-configuration>
Now I want to create the reverse engineering file for map my table, the problem is I haven't output (in table field).
In my libraries I have:
Hibernate 4.3.x
postgresql-9.3-1102.jdbc41
JDK 8
With NetBeans, when I go to Service area I can connect to my database, and see my tables with his values.
Maybe an idea, when I created the hibernate.cfg, I chose my new Driver -> Add postgresql-9.3-1102.jdbc41.jar and when I click on "find" Driver Class I have the error message: Driver class is missing. I don't know if that could be the problem.
Do you have any idea ?
Thanks for your help !

Java Hibernate/C3P0 error: "Could not obtain connection metadata. An attempt by a client to checkout a Connection has timed out."

I'm trying to get some code I was passed up and running. It appears to use the Hibernate framework. I've gotten past most of the errors tweaking the configuration, but this one has me dead stumped.
It's trying to connect to two databases: gameapp and gamelog. Both exist. It seems to have issues connecting to gamelog, but none connecting to gameapp (later in the init, it connects to and loads other DBs just fine). Below, I've pasted the error and exception stack dump.
I imaging there's something else in the configs, so I've also included the configuration file for that db. I know this is very vague, but I'm hoping some pro can see the stupid mistake I'm missing.
<?xml version="1.0" encoding="GBK"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://127.0.0.1:3306/gamelog</property>
<property name="connection.username">root</property>
<property name="connection.password"></property>
<property name="connection.useUnicode">true</property>
<property name="connection.characterEncoding">UTF-8</property>
<property name="hibernate.jdbc.batch_size">100</property>
<property name="jdbc.fetch_size">1</property>
<property name="hbm2ddl.auto">none</property><!-- update -->
<property name="connection.useUnicode">true</property>
<property name="show_sql">true</property>
<!-- c3p0-configuration -->
<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
<property name="hibernate.c3p0.min_size">5</property>
<property name="hibernate.c3p0.max_size">10</property>
<property name="hibernate.c3p0.timeout">30</property>
<property name="hibernate.c3p0.idle_test_period">30</property>
<property name="hibernate.c3p0.max_statements">0</property>
<property name="hibernate.c3p0.acquire_increment">5</property>
</session-factory>
</hibernate-configuration>
Exception and stack trace:
2010-04-30 17:50:00,411 WARN [org.hibernate.cfg.SettingsFactory] - Could not obtain connection metadata
java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:65)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:527)
at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)
at org.hibernate.connection.C3P0ConnectionProvider.getConnection(C3P0ConnectionProvider.java:35)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:76)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:1933)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1216)
at com.database.hibernate.util.HibernateFactory.<init>(Unknown Source)
at com.database.hibernate.util.HibernateUtil.<clinit>(Unknown Source)
at com.server.databaseop.goodOp.GoodOpImpl.initBreedGoods(Unknown Source)
at com.server.databaseop.goodOp.GoodOpImpl.access$000(Unknown Source)
at com.server.databaseop.goodOp.GoodOpImpl$1.run(Unknown Source)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:351)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:165)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:267)
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:636)
Caused by: com.mchange.v2.resourcepool.TimeoutException: A client timed out while waiting to acquire a resource from com.mchange.v2.resourcepool.BasicResourcePool#ca470 -- timeout at awaitAvailable()
at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1317)
at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:557)
at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525)
... 18 more

If you have set C3P0's "checkoutTimeout" property to something other than 0 you might be timing out too quickly (that was my problem, solution: bumped it to 2000 milliseconds from 500).
Alternatively, there's a workaround for this warning:
Set the hibernate.temp.use_jdbc_metadata_defaults property to false.
Found this in http://www.docjar.com/html/api/org/hibernate/cfg/SettingsFactory.java.html, though there may be side effects of not having Hibernate extract JDBC Metadata defaults.

Actually that's not even an authentication error. Is MySQL even running or bound to localhost?
does telnet 127.0.0.1 3306 work?
if so, install the mysql client on the box and try
mysql --user=root --ip=127.0.0.1
and see what happens

Check if you can connect to the gamelog mysql database on the command line with the root user and no password (!). As a side note, I'd recommend to set a password for root and to use a different account to connect to the database from your application, but that's another story.