Use slf4j to log instead of printing to System.err

CQ: 9206
Bug: 458445
Change-Id: Ic68fb7dbe0fb46bf30f157db45bf18d8f3a704c0
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

11 files changed, 62 insertions, 30 deletions

diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.feature/feature.xml b/org.eclipse.jgit.packaging/org.eclipse.jgit.feature/feature.xml
index 10ea2c9e56..def1541717 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.feature/feature.xml
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.feature/feature.xml
@@ -63,4 +63,11 @@
          version="0.0.0"
          unpack="false"/>
 
+   <plugin
+         id="org.slf4j.api"
+         download-size="0"
+         install-size="0"
+         version="0.0.0"
+         unpack="false"/>
+
 </feature>
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.3.target b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.3.target
index c0eff7da43..76361d88f2 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.3.target
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.3.target
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <?pde?>
 <!-- generated with https://github.com/mbarbero/fr.obeo.releng.targetplatform -->
-<target name="jgit-4.3" sequenceNumber="1424128174">
+<target name="jgit-4.3" sequenceNumber="1424129461">
   <locations>
     <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
       <unit id="org.eclipse.jetty.client" version="7.6.14.v20131031"/>
@@ -53,6 +53,8 @@
       <unit id="javax.servlet.source" version="2.5.0.v201103041518"/>
       <unit id="org.tukaani.xz" version="1.3.0.v201308270617"/>
       <unit id="org.tukaani.xz.source" version="1.3.0.v201308270617"/>
+      <unit id="org.slf4j.api" version="1.7.2.v20121108-1250"/>
+      <unit id="org.slf4j.api.source" version="1.7.2.v20121108-1250"/>
       <repository location="http://download.eclipse.org/tools/orbit/downloads/drops/R20150124073747/repository/"/>
     </location>
     <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.4.target b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.4.target
index c414f41526..8f7053d054 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.4.target
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.4.target
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <?pde?>
 <!-- generated with https://github.com/mbarbero/fr.obeo.releng.targetplatform -->
-<target name="jgit-4.4" sequenceNumber="1424128038">
+<target name="jgit-4.4" sequenceNumber="1424129435">
   <locations>
     <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
       <unit id="org.eclipse.jetty.client" version="7.6.14.v20131031"/>
@@ -53,6 +53,8 @@
       <unit id="javax.servlet.source" version="2.5.0.v201103041518"/>
       <unit id="org.tukaani.xz" version="1.3.0.v201308270617"/>
       <unit id="org.tukaani.xz.source" version="1.3.0.v201308270617"/>
+      <unit id="org.slf4j.api" version="1.7.2.v20121108-1250"/>
+      <unit id="org.slf4j.api.source" version="1.7.2.v20121108-1250"/>
       <repository location="http://download.eclipse.org/tools/orbit/downloads/drops/R20150124073747/repository/"/>
     </location>
     <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.5.target b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.5.target
index 45dec35aef..4909416f74 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.5.target
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/jgit-4.5.target
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <?pde?>
 <!-- generated with https://github.com/mbarbero/fr.obeo.releng.targetplatform -->
-<target name="jgit-4.5" sequenceNumber="1424127977">
+<target name="jgit-4.5" sequenceNumber="1424129206">
   <locations>
     <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
       <unit id="org.eclipse.jetty.client" version="7.6.14.v20131031"/>
@@ -53,6 +53,8 @@
       <unit id="javax.servlet.source" version="2.5.0.v201103041518"/>
       <unit id="org.tukaani.xz" version="1.3.0.v201308270617"/>
       <unit id="org.tukaani.xz.source" version="1.3.0.v201308270617"/>
+      <unit id="org.slf4j.api" version="1.7.2.v20121108-1250"/>
+      <unit id="org.slf4j.api.source" version="1.7.2.v20121108-1250"/>
       <repository location="http://download.eclipse.org/tools/orbit/downloads/drops/S20150202203538/repository/"/>
     </location>
     <location includeMode="slicer" includeAllPlatforms="false" includeSource="true" includeConfigurePhase="true" type="InstallableUnit">
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/orbit/R20150124073747-Luna-SR2.tpd b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/orbit/R20150124073747-Luna-SR2.tpd
index 5384a9a213..683a8c7ce5 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/orbit/R20150124073747-Luna-SR2.tpd
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/orbit/R20150124073747-Luna-SR2.tpd
@@ -32,4 +32,6 @@ location "http://download.eclipse.org/tools/orbit/downloads/drops/R2015012407374
 	javax.servlet.source [2.5.0.v201103041518,2.5.0.v201103041518]
 	org.tukaani.xz [1.3.0.v201308270617,1.3.0.v201308270617]
 	org.tukaani.xz.source [1.3.0.v201308270617,1.3.0.v201308270617]
+	org.slf4j.api [1.7.2.v20121108-1250,1.7.2.v20121108-1250]
+	org.slf4j.api.source [1.7.2.v20121108-1250,1.7.2.v20121108-1250]
 }
\ No newline at end of file
diff --git a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/orbit/S20150202203538-Mars-M5.tpd b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/orbit/S20150202203538-Mars-M5.tpd
index d41a5f4dfe..415fdca5d0 100644
--- a/org.eclipse.jgit.packaging/org.eclipse.jgit.target/orbit/S20150202203538-Mars-M5.tpd
+++ b/org.eclipse.jgit.packaging/org.eclipse.jgit.target/orbit/S20150202203538-Mars-M5.tpd
@@ -32,4 +32,6 @@ location "http://download.eclipse.org/tools/orbit/downloads/drops/S2015020220353
 	javax.servlet.source [2.5.0.v201103041518,2.5.0.v201103041518]
 	org.tukaani.xz [1.3.0.v201308270617,1.3.0.v201308270617]
 	org.tukaani.xz.source [1.3.0.v201308270617,1.3.0.v201308270617]
+	org.slf4j.api [1.7.2.v20121108-1250,1.7.2.v20121108-1250]
+	org.slf4j.api.source [1.7.2.v20121108-1250,1.7.2.v20121108-1250]
 }
\ No newline at end of file
diff --git a/org.eclipse.jgit/META-INF/MANIFEST.MF b/org.eclipse.jgit/META-INF/MANIFEST.MF
index eea13ec7be..55ef0605b2 100644
--- a/org.eclipse.jgit/META-INF/MANIFEST.MF
+++ b/org.eclipse.jgit/META-INF/MANIFEST.MF
@@ -147,5 +147,6 @@ Require-Bundle: com.jcraft.jsch;bundle-version="[0.1.37,0.2.0)"
 Import-Package: com.googlecode.javaewah;version="[0.7.9,0.8.0)",
  javax.crypto,
  javax.net.ssl,
+ org.slf4j;version="[1.7.0,2.0.0)",
  org.xml.sax,
  org.xml.sax.helpers
diff --git a/org.eclipse.jgit/pom.xml b/org.eclipse.jgit/pom.xml
index 36a579ec22..6ca299ed5b 100644
--- a/org.eclipse.jgit/pom.xml
+++ b/org.eclipse.jgit/pom.xml
@@ -83,6 +83,11 @@
       <groupId>org.apache.httpcomponents</groupId>
       <artifactId>httpclient</artifactId>
     </dependency>
+
+    <dependency>
+      <groupId>org.slf4j</groupId>
+      <artifactId>slf4j-api</artifactId>
+    </dependency>
   </dependencies>
 
   <build>
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/ObjectDirectory.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/ObjectDirectory.java
index adbe1f8652..687408e19d 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/ObjectDirectory.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/ObjectDirectory.java
@@ -52,8 +52,6 @@ import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FileReader;
 import java.io.IOException;
-import java.io.PrintWriter;
-import java.io.StringWriter;
 import java.text.MessageFormat;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -85,6 +83,8 @@ import org.eclipse.jgit.lib.RepositoryCache;
 import org.eclipse.jgit.lib.RepositoryCache.FileKey;
 import org.eclipse.jgit.util.FS;
 import org.eclipse.jgit.util.FileUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * Traditional file system based {@link ObjectDatabase}.
@@ -105,6 +105,9 @@ import org.eclipse.jgit.util.FileUtils;
  * considered.
  */
 public class ObjectDirectory extends FileObjectDatabase {
+	private final static Logger LOG = LoggerFactory
+			.getLogger(ObjectDirectory.class);
+
 	private static final PackList NO_PACKS = new PackList(
 			FileSnapshot.DIRTY, new PackFile[0]);
 
@@ -565,14 +568,8 @@ public class ObjectDirectory extends FileObjectDatabase {
 			// Don't remove the pack from the list, as the error may be
 			// transient.
 		}
-		StringBuilder buf = new StringBuilder(MessageFormat.format(tmpl,
-				p.getPackFile().getAbsolutePath()));
-		StringWriter sw = new StringWriter();
-		e.printStackTrace(new PrintWriter(sw));
-		buf.append('\n');
-		buf.append(sw.toString());
-		// TODO instead of syserr we should use a logging framework
-		System.err.println(buf.toString());
+		LOG.error(MessageFormat.format(tmpl,
+				p.getPackFile().getAbsolutePath()), e);
 	}
 
 	@Override
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/util/FS.java b/org.eclipse.jgit/src/org/eclipse/jgit/util/FS.java
index 081bf87c54..875e12f57b 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/util/FS.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/util/FS.java
@@ -69,6 +69,8 @@ import org.eclipse.jgit.internal.JGitText;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.Repository;
 import org.eclipse.jgit.util.ProcessResult.Status;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /** Abstraction to support various file system operations not in Java. */
 public abstract class FS {
@@ -107,6 +109,8 @@ public abstract class FS {
 		}
 	}
 
+	private final static Logger LOG = LoggerFactory.getLogger(FS.class);
+
 	/** The auto-detected implementation selected for this operating system and JRE. */
 	public static final FS DETECTED = detect();
 
@@ -418,12 +422,12 @@ public abstract class FS {
 	 * @return the one-line output of the command
 	 */
 	protected static String readPipe(File dir, String[] command, String encoding) {
-		final boolean debug = Boolean.parseBoolean(SystemReader.getInstance()
-				.getProperty("jgit.fs.debug")); //$NON-NLS-1$
+		final boolean debug = LOG.isDebugEnabled();
 		try {
-			if (debug)
-				System.err.println("readpipe " + Arrays.asList(command) + "," //$NON-NLS-1$ //$NON-NLS-2$
+			if (debug) {
+				LOG.debug("readpipe " + Arrays.asList(command) + "," //$NON-NLS-1$ //$NON-NLS-2$
 						+ dir);
+			}
 			final Process p = Runtime.getRuntime().exec(command, null, dir);
 			final BufferedReader lineRead = new BufferedReader(
 					new InputStreamReader(p.getInputStream(), encoding));
@@ -451,8 +455,9 @@ public abstract class FS {
 						is.close();
 					} catch (IOException e) {
 						// Just print on stderr for debugging
-						if (debug)
-							e.printStackTrace(System.err);
+						if (debug) {
+							LOG.debug("Caught exception in gobbler thread", e); //$NON-NLS-1$
+						}
 						gooblerFail.set(true);
 					}
 				}
@@ -462,13 +467,14 @@ public abstract class FS {
 			try {
 				r = lineRead.readLine();
 				if (debug) {
-					System.err.println("readpipe may return '" + r + "'"); //$NON-NLS-1$ //$NON-NLS-2$
-					System.err.println("(ignoring remaing output:"); //$NON-NLS-1$
+					LOG.debug("readpipe may return '" + r + "'"); //$NON-NLS-1$ //$NON-NLS-2$
+					LOG.debug("(ignoring remaing output:"); //$NON-NLS-1$
 				}
 				String l;
 				while ((l = lineRead.readLine()) != null) {
-					if (debug)
-						System.err.println(l);
+					if (debug) {
+						LOG.debug(l);
+					}
 				}
 			} finally {
 				p.getErrorStream().close();
@@ -482,20 +488,20 @@ public abstract class FS {
 					if (rc == 0 && r != null && r.length() > 0
 							&& !gooblerFail.get())
 						return r;
-					if (debug)
-						System.err.println("readpipe rc=" + rc); //$NON-NLS-1$
+					if (debug) {
+						LOG.debug("readpipe rc=" + rc); //$NON-NLS-1$
+					}
 					break;
 				} catch (InterruptedException ie) {
 					// Stop bothering me, I have a zombie to reap.
 				}
 			}
 		} catch (IOException e) {
-			if (debug)
-				System.err.println(e);
-			// Ignore error (but report)
+			LOG.error("Caught exception in FS.readPipe()", e); //$NON-NLS-1$
+		}
+		if (debug) {
+			LOG.debug("readpipe returns null"); //$NON-NLS-1$
 		}
-		if (debug)
-			System.err.println("readpipe returns null"); //$NON-NLS-1$
 		return null;
 	}
 
diff --git a/pom.xml b/pom.xml
index d222dc2ba4..128d793777 100644
--- a/pom.xml
+++ b/pom.xml
@@ -189,6 +189,7 @@
     <jetty-version>7.6.14.v20131031</jetty-version>
     <clirr-version>2.6.1</clirr-version>
     <httpclient-version>4.1.3</httpclient-version>
+    <slf4j-version>1.7.2</slf4j-version>
     <maven-javadoc-plugin-version>2.9.1</maven-javadoc-plugin-version>
 
     <!-- Properties to enable jacoco code coverage analysis -->
@@ -543,6 +544,11 @@
         <artifactId>httpclient</artifactId>
         <version>${httpclient-version}</version>
       </dependency>
+      <dependency>
+        <groupId>org.slf4j</groupId>
+        <artifactId>slf4j-api</artifactId>
+        <version>${slf4j-version}</version>
+      </dependency>
     </dependencies>
   </dependencyManagement>