use log4j in pdb-ui

pdb-ui/build.gradle

@@ -8,7 +8,10 @@ dependencies {
 	compile project(':performanceDb')
 	compile project(':pdb-plotting')
 	
-	compile("org.springframework.boot:spring-boot-starter-web:1.5.1.RELEASE")
+	compile("org.springframework.boot:spring-boot-starter-web:1.5.1.RELEASE"){
+		exclude module: 'spring-boot-starter-logging'
+	}
+	compile("org.springframework.boot:spring-boot-starter-log4j2:1.5.1.RELEASE")
 	
 	testCompile("org.springframework.boot:spring-boot-starter-test:1.5.1.RELEASE")
 }

performanceDb/src/main/java/org/lucares/performance/db/PerformanceDb.java

@@ -11,7 +11,6 @@ import java.util.Optional;
 import java.util.Spliterator;
 import java.util.Spliterators;
 import java.util.concurrent.BlockingQueue;
-import java.util.logging.Logger;
 import java.util.stream.Stream;
 import java.util.stream.StreamSupport;
 
@@ -23,9 +22,11 @@ import org.lucares.pdb.api.Entry;
 import org.lucares.pdb.api.GroupResult;
 import org.lucares.pdb.api.Result;
 import org.lucares.pdb.api.Tags;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class PerformanceDb implements AutoCloseable, CollectionUtils {
-	private static final Logger LOGGER = Logger.getLogger(PerformanceDb.class.getCanonicalName());
+	private final static Logger LOGGER = LoggerFactory.getLogger(PerformanceDb.class);
 
 	private final TagsToFile tagsToFile;
 
@@ -84,7 +85,7 @@ public class PerformanceDb implements AutoCloseable, CollectionUtils {
 				if (count % blocksize == 0) {
 					final long end = System.nanoTime();
 					final double duration = (end - start) / 1_000_000.0;
-					LOGGER.info("inserting the last " + blocksize + " took " + duration + " ms; " + Stats.duration
+					LOGGER.debug("inserting the last " + blocksize + " took " + duration + " ms; " + Stats.duration
 							+ "ms of " + Stats.count + " operations. total entries: " + count / 1_000_000.0
 							+ " million");
 
@@ -107,7 +108,7 @@ public class PerformanceDb implements AutoCloseable, CollectionUtils {
 			LOGGER.info("Thread was interrupted. Aborting exectution.");
 		} finally {
 			tagsToFile.flush();
-			LOGGER.info("flushed all files.");
+			LOGGER.debug("flushed all files.");
 		}
 	}
 
@@ -159,7 +160,7 @@ public class PerformanceDb implements AutoCloseable, CollectionUtils {
 			try {
 				iterator.close();
 			} catch (final RuntimeException e) {
-				e.printStackTrace();
+				LOGGER.info("runtime exception while closing iterator", e);
 			}
 		});
 		return result;

performanceDb/src/main/resources/log4j2.properties

@@ -9,5 +9,5 @@ appender.console.layout.pattern = %d{yyyy-MM-dd HH:mm:ss.SSS} [%-5level] [%t] %c
  
  
  
-rootLogger.level = trace
-rootLogger.appenderRef.stdout.ref = STDOUT
+rootLogger.level = info
+rootLogger.appenderRef.stdout.ref = STDOUT