[Enhancement #243] Log JOPA version info on PU start.

jopa-impl/pom.xml

@@ -15,6 +15,8 @@
     <packaging>jar</packaging>
 
     <properties>
+        <maven.build.timestamp.format>yyyy-MM-dd</maven.build.timestamp.format>
+
         <org.antlr4.version>4.12.0</org.antlr4.version>
         <net.bytebuddy.version>1.14.8</net.bytebuddy.version>
     </properties>
@@ -49,6 +51,12 @@
 
 
     <build>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
         <plugins>
             <plugin>
                 <groupId>org.antlr</groupId>
@@ -63,6 +71,11 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-resources-plugin</artifactId>
+                <version>3.3.1</version>
+            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>

jopa-impl/src/main/java/cz/cvut/kbss/jopa/model/JOPAPersistenceProvider.java

@@ -17,19 +17,46 @@
  */
 package cz.cvut.kbss.jopa.model;
 
-import java.util.*;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Properties;
+import java.util.Set;
 
 public class JOPAPersistenceProvider implements PersistenceProvider, ProviderUtil {
 
+    private static final Logger LOG = LoggerFactory.getLogger(JOPAPersistenceProvider.class);
+
     private static final Set<EntityManagerFactoryImpl> EMFS = Collections.synchronizedSet(new HashSet<>());
 
+    public JOPAPersistenceProvider() {
+        logVersionInfo();
+    }
+
     @Override
     public EntityManagerFactoryImpl createEntityManagerFactory(String emName, Map<String, String> properties) {
         final EntityManagerFactoryImpl emf = new EntityManagerFactoryImpl(properties, this::emfClosed);
         EMFS.add(emf);
         return emf;
     }
 
+    private static void logVersionInfo() {
+        try {
+            final Properties props = new Properties();
+            props.load(JOPAPersistenceProvider.class.getClassLoader().getResourceAsStream("jopa.properties"));
+            assert props.containsKey("cz.cvut.jopa.version");
+            assert props.containsKey("cz.cvut.jopa.build.timestamp");
+            LOG.info("This is JOPA {}, built on {}...", props.get("cz.cvut.jopa.version"), props.get("cz.cvut.jopa.build.timestamp"));
+        } catch (IOException e) {
+            LOG.warn("Unable to load properties file to log version info.", e);
+        }
+    }
+
     void emfClosed(EntityManagerFactoryImpl emf) {
         EMFS.remove(emf);
     }

jopa-impl/src/main/resources/jopa.properties

@@ -0,0 +1,2 @@
+cz.cvut.jopa.version=${project.version}
+cz.cvut.jopa.build.timestamp=${maven.build.timestamp}