Here is my persistence.xml:
<?xml version="1.0" encoding="UTF-8"?> <persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"> <persistence-unit name="PU" transaction-type="RESOURCE_LOCAL"> <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider> <exclude-unlisted-classes>false</exclude-unlisted-classes> <properties> <property name="javax.persistence.jdbc.url" value="jdbc:sqlserver://localhost:1433;databaseName=SocialDB"/> <property name="javax.persistence.jdbc.user" value="ramy"/> <property name="javax.persistence.jdbc.driver" value="com.microsoft.sqlserver.jdbc.SQLServerDriver"/> <property name="javax.persistence.jdbc.password" value="%=4b[E6c"/> <property name="hibernate.cache.provider_class" value="org.hibernate.cache.NoCacheProvider"/> </properties> </persistence-unit> </persistence> And here is the error:
Root Cause javax.persistence.PersistenceException: Invalid persistence.xml. Error parsing XML (line-1 : column -1): cvc-elt.1.a: Cannot find the declaration of element 'persistence'. org.hibernate.ejb.packaging.PersistenceXmlLoader.loadURL(PersistenceXmlLoader.java:147) org.hibernate.ejb.packaging.PersistenceXmlLoader.deploy(PersistenceXmlLoader.java:171) org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:326) org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:58) javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63) javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:47) bo.MyEntityManagerFactory.getEntityManager(MyEntityManagerFactory.java:22) bo.UserHandler.getAllUsers(UserHandler.java:106) bo.UserHandler.getAllUserViewsTrimmed(UserHandler.java:88) I receive this error once upon starting the server as well as each time I perform a database query.
Edit: Here are my (Maven) dependencies (The project is a web microservice that interfaces with an MSSQL database using Hibernate, and uses jersey framework to convert from/to JSON object in order to read to/write from the aforementioned database):
<groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.10.1</version> <type>jar</type> </dependency> <dependency> <groupId>org.glassfish.jersey</groupId> <artifactId>project</artifactId> <version>2.26</version> <type>pom</type> </dependency> <dependency> <groupId>org.glassfish.jersey.containers</groupId> <artifactId>jersey-container-servlet</artifactId> <version>2.26</version> </dependency> <dependency> <groupId>org.glassfish.jersey.core</groupId> <artifactId>jersey-client</artifactId> <version>2.26</version> </dependency> <dependency> <groupId>org.glassfish.jersey.core</groupId> <artifactId>jersey-server</artifactId> <version>2.26</version> </dependency> <dependency> <groupId>org.glassfish.jersey.core</groupId> <artifactId>jersey-common</artifactId> <version>2.26</version> </dependency> <!-- https://mvnrepository.com/artifact/javax.persistence/javax.persistence-api --> <dependency> <groupId>javax.persistence</groupId> <artifactId>javax.persistence-api</artifactId> <version>2.2</version> </dependency> <!-- https://mvnrepository.com/artifact/javax/javaee-web-api --> <dependency> <groupId>org.eclipse.persistence</groupId> <artifactId>org.eclipse.persistence.core</artifactId> <version>2.5.2</version> </dependency> <dependency> <groupId>org.eclipse.persistence</groupId> <artifactId>org.eclipse.persistence.asm</artifactId> <version>2.5.2</version> </dependency> <dependency> <groupId>org.eclipse.persistence</groupId> <artifactId>org.eclipse.persistence.antlr</artifactId> <version>2.5.2</version> </dependency> <dependency> <groupId>org.eclipse.persistence</groupId> <artifactId>org.eclipse.persistence.jpa</artifactId> <version>2.5.2</version> </dependency> <dependency> <groupId>org.eclipse.persistence</groupId> <artifactId>org.eclipse.persistence.jpa.jpql</artifactId> <version>2.5.2</version> </dependency> <dependency> <groupId>org.eclipse.persistence</groupId> <artifactId>javax.persistence</artifactId> <version>2.1.0</version> </dependency> <dependency> <groupId>org.eclipse.persistence</groupId> <artifactId>org.eclipse.persistence.jpa.modelgen.processor</artifactId> <version>2.5.2</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax</groupId> <artifactId>javaee-web-api</artifactId> <version>7.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>com.googlecode.json-simple</groupId> <artifactId>json-simple</artifactId> <version>1.1</version> </dependency> <dependency> <groupId>org.glassfish.jersey.inject</groupId> <artifactId>jersey-hk2</artifactId> <version>2.26</version> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-core</artifactId> <version>4.3.0.Final</version> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-entitymanager</artifactId> <version>4.3.0.Final</version> </dependency> <dependency> <groupId>com.microsoft.sqlserver</groupId> <artifactId>mssql-jdbc</artifactId> <version>6.1.0.jre8</version> </dependency> 
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