Use Logger instead of System.out and System.err (#10328).

Change-Id: Icf53bdb80caf7a6989b90cf5ce83dd328d3e73dd

17 files changed, 185 insertions, 57 deletions

diff --git a/theme-compiler/build.xml b/theme-compiler/build.xml
index 03d0531a68..324934bd10 100644
--- a/theme-compiler/build.xml
+++ b/theme-compiler/build.xml
@@ -20,8 +20,7 @@
     </path>
     <path id="classpath.test.custom" />
 
-    <!--<property name="classes.exclude" value="com/vaadin/buildhelpers/**" 
-        /> -->
+    <property name="classes.exclude" value="**/*.properties"/>
 
     <target name="parser">
         <!-- Copy javacc-5.0.jar to ${result.dir}/javacc/javacc.jar as the 
diff --git a/theme-compiler/src/com/vaadin/sass/CustomConsoleHandler.java b/theme-compiler/src/com/vaadin/sass/CustomConsoleHandler.java
new file mode 100644
index 0000000000..44c9e345db
--- /dev/null
+++ b/theme-compiler/src/com/vaadin/sass/CustomConsoleHandler.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2000-2013 Vaadin Ltd.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.vaadin.sass;
+
+import java.io.PrintStream;
+import java.util.logging.ConsoleHandler;
+import java.util.logging.Level;
+import java.util.logging.LogRecord;
+
+/**
+ * 
+ * @since
+ * @author Vaadin Ltd
+ */
+public class CustomConsoleHandler extends ConsoleHandler {
+
+    private ConsoleHandler stdoutHandler;
+
+    public CustomConsoleHandler() {
+        PrintStream err = System.err;
+        /*
+         * ConsoleHandler uses System.err to output all messages. Replace
+         * System.err temporary to construct ConsoleHandler and set it back
+         * after construction.
+         */
+        System.setErr(System.out);
+        stdoutHandler = new ConsoleHandler();
+        System.setErr(err);
+    }
+
+    @Override
+    public void publish(LogRecord record) {
+        if (!Level.SEVERE.equals(record.getLevel())) {
+            stdoutHandler.publish(record);
+        } else {
+            super.publish(record);
+        }
+    }
+}
diff --git a/theme-compiler/src/com/vaadin/sass/internal/ScssStylesheet.java b/theme-compiler/src/com/vaadin/sass/internal/ScssStylesheet.java
index ed6b98f5ac..63f59cdfab 100644
--- a/theme-compiler/src/com/vaadin/sass/internal/ScssStylesheet.java
+++ b/theme-compiler/src/com/vaadin/sass/internal/ScssStylesheet.java
@@ -24,11 +24,13 @@ import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.logging.LogManager;
 import java.util.logging.Logger;
 
 import org.w3c.css.sac.CSSException;
 import org.w3c.css.sac.InputSource;
 
+import com.vaadin.buildhelpers.CompileTheme;
 import com.vaadin.sass.internal.handler.SCSSDocumentHandler;
 import com.vaadin.sass.internal.handler.SCSSDocumentHandlerImpl;
 import com.vaadin.sass.internal.handler.SCSSErrorHandler;
@@ -457,4 +459,19 @@ public class ScssStylesheet extends Node {
     public void setCharset(String charset) {
         this.charset = charset;
     }
+
+    static {
+        String logFile = System.getProperty("java.util.logging.config.file");
+        if (logFile == null) {
+            try {
+                LogManager.getLogManager().readConfiguration(
+                        CompileTheme.class
+                                .getResourceAsStream("/logging.properties"));
+            } catch (SecurityException e) {
+                e.printStackTrace();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+    }
 }
diff --git a/theme-compiler/src/com/vaadin/sass/internal/handler/SCSSDocumentHandlerImpl.java b/theme-compiler/src/com/vaadin/sass/internal/handler/SCSSDocumentHandlerImpl.java
index 99f00e3889..aa6d39fd77 100644
--- a/theme-compiler/src/com/vaadin/sass/internal/handler/SCSSDocumentHandlerImpl.java
+++ b/theme-compiler/src/com/vaadin/sass/internal/handler/SCSSDocumentHandlerImpl.java
@@ -20,6 +20,8 @@ import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 import java.util.Stack;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 import org.w3c.css.sac.CSSException;
 import org.w3c.css.sac.InputSource;
@@ -98,7 +100,7 @@ public class SCSSDocumentHandlerImpl implements SCSSDocumentHandler {
     public ForNode forDirective(String var, String from, String to,
             boolean exclusive, String body) {
         ForNode node = new ForNode(var, from, to, exclusive, body);
-        System.out.println(node);
+        log(node);
         return node;
     }
 
@@ -126,7 +128,7 @@ public class SCSSDocumentHandlerImpl implements SCSSDocumentHandler {
     @Override
     public WhileNode whileDirective(String condition, String body) {
         WhileNode node = new WhileNode(condition, body);
-        System.out.println(node);
+        log(node);
         return node;
     }
 
@@ -138,14 +140,14 @@ public class SCSSDocumentHandlerImpl implements SCSSDocumentHandler {
 
     @Override
     public void ignorableAtRule(String atRule) throws CSSException {
-        System.out.println("ignorableAtRule(String atRule): " + atRule);
+        log("ignorableAtRule(String atRule): " + atRule);
     }
 
     @Override
     public void namespaceDeclaration(String prefix, String uri)
             throws CSSException {
-        System.out.println("namespaceDeclaration(String prefix, String uri): "
-                + prefix + ", " + uri);
+        log("namespaceDeclaration(String prefix, String uri): " + prefix + ", "
+                + uri);
     }
 
     @Override
@@ -167,14 +169,14 @@ public class SCSSDocumentHandlerImpl implements SCSSDocumentHandler {
 
     @Override
     public void startPage(String name, String pseudo_page) throws CSSException {
-        System.out.println("startPage(String name, String pseudo_page): "
-                + name + ", " + pseudo_page);
+        log("startPage(String name, String pseudo_page): " + name + ", "
+                + pseudo_page);
     }
 
     @Override
     public void endPage(String name, String pseudo_page) throws CSSException {
-        System.out.println("endPage(String name, String pseudo_page): " + name
-                + ", " + pseudo_page);
+        log("endPage(String name, String pseudo_page): " + name + ", "
+                + pseudo_page);
     }
 
     @Override
@@ -386,4 +388,17 @@ public class SCSSDocumentHandlerImpl implements SCSSDocumentHandler {
     public void endIncludeContentBlock() {
         nodeStack.pop();
     }
+
+    private void log(Object object) {
+        if (object != null) {
+            log(object.toString());
+        } else {
+            log(null);
+        }
+    }
+
+    private void log(String msg) {
+        Logger.getLogger(SCSSDocumentHandlerImpl.class.getName()).log(
+                Level.INFO, msg);
+    }
 }
diff --git a/theme-compiler/src/com/vaadin/sass/internal/handler/SCSSErrorHandler.java b/theme-compiler/src/com/vaadin/sass/internal/handler/SCSSErrorHandler.java
index 0d48da34e4..a7c65073ee 100644
--- a/theme-compiler/src/com/vaadin/sass/internal/handler/SCSSErrorHandler.java
+++ b/theme-compiler/src/com/vaadin/sass/internal/handler/SCSSErrorHandler.java
@@ -15,7 +15,8 @@
  */
 package com.vaadin.sass.internal.handler;
 
-import java.io.PrintStream;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 import org.w3c.css.sac.CSSException;
 import org.w3c.css.sac.CSSParseException;
@@ -23,38 +24,33 @@ import org.w3c.css.sac.ErrorHandler;
 
 public class SCSSErrorHandler implements ErrorHandler {
 
-    private PrintStream errorStream;
-
-    public SCSSErrorHandler(PrintStream errorStream) {
-        this.errorStream = errorStream;
-    }
-
     public SCSSErrorHandler() {
-        this(System.out);
     }
 
     @Override
     public void error(CSSParseException arg0) throws CSSException {
-        errorStream.println("Error when parsing file \n" + arg0.getURI()
-                + " on line " + arg0.getLineNumber() + ", column "
-                + arg0.getColumnNumber());
-        errorStream.println(arg0.getMessage() + "\n");
+        log("Error when parsing file \n" + arg0.getURI() + " on line "
+                + arg0.getLineNumber() + ", column " + arg0.getColumnNumber());
+        log(arg0.getMessage() + "\n");
     }
 
     @Override
     public void fatalError(CSSParseException arg0) throws CSSException {
-        errorStream.println("FATAL Error when parsing file \n" + arg0.getURI()
-                + " on line " + arg0.getLineNumber() + ", column "
-                + arg0.getColumnNumber());
-        errorStream.println(arg0.getMessage() + "\n");
+        log("FATAL Error when parsing file \n" + arg0.getURI() + " on line "
+                + arg0.getLineNumber() + ", column " + arg0.getColumnNumber());
+        log(arg0.getMessage() + "\n");
     }
 
     @Override
     public void warning(CSSParseException arg0) throws CSSException {
-        errorStream.println("Warning when parsing file \n" + arg0.getURI()
-                + " on line " + arg0.getLineNumber() + ", column "
-                + arg0.getColumnNumber());
-        errorStream.println(arg0.getMessage() + "\n");
+        log("Warning when parsing file \n" + arg0.getURI() + " on line "
+                + arg0.getLineNumber() + ", column " + arg0.getColumnNumber());
+        log(arg0.getMessage() + "\n");
+    }
+
+    private void log(String msg) {
+        Logger.getLogger(SCSSDocumentHandlerImpl.class.getName()).log(
+                Level.SEVERE, msg);
     }
 
 }
diff --git a/theme-compiler/src/com/vaadin/sass/internal/parser/LocatorImpl.java b/theme-compiler/src/com/vaadin/sass/internal/parser/LocatorImpl.java
index ac244a9582..35589e0a94 100644
--- a/theme-compiler/src/com/vaadin/sass/internal/parser/LocatorImpl.java
+++ b/theme-compiler/src/com/vaadin/sass/internal/parser/LocatorImpl.java
@@ -23,8 +23,13 @@
  */
 package com.vaadin.sass.internal.parser;
 
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
 import org.w3c.css.sac.Locator;
 
+import com.vaadin.sass.internal.handler.SCSSDocumentHandlerImpl;
+
 /**
  * @version $Revision: 1.2 $
  * @author Philippe Le Hegaret
@@ -51,14 +56,17 @@ public class LocatorImpl implements Locator {
     int line;
     int column;
 
+    @Override
     public String getURI() {
         return uri;
     }
 
+    @Override
     public int getLineNumber() {
         return line;
     }
 
+    @Override
     public int getColumnNumber() {
         return column;
     }
@@ -68,7 +76,7 @@ public class LocatorImpl implements Locator {
      */
     public LocatorImpl(Parser p) {
         if (W3CDebug) {
-            System.err.println("LocatorImpl::newLocator(" + p + ");");
+            log("LocatorImpl::newLocator(" + p + ");");
         }
         uri = p.source.getURI();
         line = p.token.beginLine;
@@ -80,8 +88,7 @@ public class LocatorImpl implements Locator {
      */
     public LocatorImpl(Parser p, Token tok) {
         if (W3CDebug) {
-            System.err.println("LocatorImpl::newLocator(" + p + ", " + tok
-                    + ");");
+            log("LocatorImpl::newLocator(" + p + ", " + tok + ");");
         }
         uri = p.source.getURI();
         line = tok.beginLine;
@@ -93,8 +100,8 @@ public class LocatorImpl implements Locator {
      */
     public LocatorImpl(Parser p, int line, int column) {
         if (W3CDebug) {
-            System.err.println("LocatorImpl::newLocator(" + p + ", " + line
-                    + ", " + column + ");");
+            log("LocatorImpl::newLocator(" + p + ", " + line + ", " + column
+                    + ");");
         }
         uri = p.source.getURI();
         this.line = line;
@@ -106,7 +113,7 @@ public class LocatorImpl implements Locator {
      */
     public LocatorImpl reInit(Parser p) {
         if (W3CDebug) {
-            System.err.println("LocatorImpl::reInit(" + p + ");");
+            log("LocatorImpl::reInit(" + p + ");");
         }
         uri = p.source.getURI();
         line = p.token.beginLine;
@@ -119,7 +126,7 @@ public class LocatorImpl implements Locator {
      */
     public LocatorImpl reInit(Parser p, Token tok) {
         if (W3CDebug) {
-            System.err.println("LocatorImpl::reInit(" + p + ", " + tok + ");");
+            log("LocatorImpl::reInit(" + p + ", " + tok + ");");
         }
         uri = p.source.getURI();
         line = tok.beginLine;
@@ -132,12 +139,16 @@ public class LocatorImpl implements Locator {
      */
     public LocatorImpl reInit(Parser p, int line, int column) {
         if (W3CDebug) {
-            System.err.println("LocatorImpl::reInit(" + p + ", " + line + ", "
-                    + column + ");");
+            log("LocatorImpl::reInit(" + p + ", " + line + ", " + column + ");");
         }
         uri = p.source.getURI();
         this.line = line;
         this.column = column;
         return this;
     }
+
+    private void log(String msg) {
+        Logger.getLogger(SCSSDocumentHandlerImpl.class.getName()).log(
+                Level.SEVERE, msg);
+    }
 }
diff --git a/theme-compiler/src/com/vaadin/sass/internal/parser/Parser.java b/theme-compiler/src/com/vaadin/sass/internal/parser/Parser.java
index 2615ef322f..79dd65e805 100644
--- a/theme-compiler/src/com/vaadin/sass/internal/parser/Parser.java
+++ b/theme-compiler/src/com/vaadin/sass/internal/parser/Parser.java
@@ -22,6 +22,8 @@ import java.util.ArrayList;
 import java.util.Locale;
 import java.util.Map;
 import java.util.UUID;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 import org.w3c.css.sac.ConditionFactory;
 import org.w3c.css.sac.Condition;
@@ -1203,7 +1205,7 @@ public class Parser implements org.w3c.css.sac.Parser, ParserConstants {
 
     } finally {
      if (start) {
-         documentHandler.endMedia(ml);
+     documentHandler.endMedia(ml);
      }
     }
   }
@@ -4527,7 +4529,7 @@ boolean isPseudoElement = false;
     jj_consume_token(DEBUG_SYM);
     String content = skipStatementUntilSemiColon();
     // TODO should evaluate the content expression, call documentHandler.debugDirective() etc.
-    System.out.println(content);
+    Logger.getLogger(Parser.class.getName()).log(Level.INFO, content);
     label_138:
     while (true) {
       switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
@@ -4546,7 +4548,7 @@ boolean isPseudoElement = false;
     jj_consume_token(WARN_SYM);
     String content = skipStatementUntilSemiColon();
     // TODO should evaluate the content expression, call documentHandler.warnDirective() etc.
-    System.err.println(content);
+    Logger.getLogger(Parser.class.getName()).log(Level.SEVERE, content);
     label_139:
     while (true) {
       switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
diff --git a/theme-compiler/src/com/vaadin/sass/internal/parser/Parser.jj b/theme-compiler/src/com/vaadin/sass/internal/parser/Parser.jj
index 196e02878a..f4752a502a 100644
--- a/theme-compiler/src/com/vaadin/sass/internal/parser/Parser.jj
+++ b/theme-compiler/src/com/vaadin/sass/internal/parser/Parser.jj
@@ -40,6 +40,8 @@ import java.util.ArrayList;
 import java.util.Locale;
 import java.util.Map;
 import java.util.UUID;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 import org.w3c.css.sac.ConditionFactory;
 import org.w3c.css.sac.Condition;
@@ -1937,7 +1939,7 @@ void debugDirective() :
     { 
     String content = skipStatementUntilSemiColon();
     // TODO should evaluate the content expression, call documentHandler.debugDirective() etc.
-    System.out.println(content);
+    Logger.getLogger(Parser.class.getName()).log(Level.INFO, content);
     }
     (<S>)*
 }
@@ -1949,7 +1951,7 @@ void warnDirective() :
     { 
     String content = skipStatementUntilSemiColon();
     // TODO should evaluate the content expression, call documentHandler.warnDirective() etc.
-    System.err.println(content);
+    Logger.getLogger(Parser.class.getName()).log(Level.SEVERE, content);
     }
     (<S>)*
 }
diff --git a/theme-compiler/src/com/vaadin/sass/internal/parser/ParserTokenManager.java b/theme-compiler/src/com/vaadin/sass/internal/parser/ParserTokenManager.java
index d54ab4fa7e..0db4e4e2f8 100644
--- a/theme-compiler/src/com/vaadin/sass/internal/parser/ParserTokenManager.java
+++ b/theme-compiler/src/com/vaadin/sass/internal/parser/ParserTokenManager.java
@@ -21,6 +21,8 @@ import java.util.ArrayList;
 import java.util.Locale;
 import java.util.Map;
 import java.util.UUID;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 import org.w3c.css.sac.ConditionFactory;
 import org.w3c.css.sac.Condition;
 import org.w3c.css.sac.SelectorFactory;
diff --git a/theme-compiler/src/com/vaadin/sass/internal/selector/SelectorUtil.java b/theme-compiler/src/com/vaadin/sass/internal/selector/SelectorUtil.java
index 744b560116..c1f26f968e 100644
--- a/theme-compiler/src/com/vaadin/sass/internal/selector/SelectorUtil.java
+++ b/theme-compiler/src/com/vaadin/sass/internal/selector/SelectorUtil.java
@@ -16,6 +16,9 @@
 
 package com.vaadin.sass.internal.selector;
 
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
 import org.w3c.css.sac.CombinatorCondition;
 import org.w3c.css.sac.Condition;
 import org.w3c.css.sac.ConditionFactory;
@@ -115,7 +118,7 @@ public class SelectorUtil {
         } else if (selector.getSelectorType() == CompositeSelector.SCSS_COMPOSITE_SELECTOR) {
             return toString((CompositeSelector) selector);
         } else {
-            System.out.println("SU !Unknown selector type, type: "
+            log("SU !Unknown selector type, type: "
                     + selector.getSelectorType() + ", " + selector.toString());
         }
         return "";
@@ -162,8 +165,8 @@ public class SelectorUtil {
             PseudoClassConditionImpl pseudoClassCondition = (PseudoClassConditionImpl) condition;
             return ":" + pseudoClassCondition.getValue();
         } else {
-            System.out.println("CU !condition type not identified, type: "
-                    + conditionType + ", " + condition.toString());
+            log("CU !condition type not identified, type: " + conditionType
+                    + ", " + condition.toString());
             return "";
         }
     }
@@ -330,4 +333,8 @@ public class SelectorUtil {
             throw new Exception("Invalid selector type");
         }
     }
+
+    private static void log(String msg) {
+        Logger.getLogger(SelectorUtil.class.getName()).log(Level.INFO, msg);
+    }
 }
diff --git a/theme-compiler/src/com/vaadin/sass/internal/tree/BlockNode.java b/theme-compiler/src/com/vaadin/sass/internal/tree/BlockNode.java
index 6ce67a3abd..8db522ea1a 100644
--- a/theme-compiler/src/com/vaadin/sass/internal/tree/BlockNode.java
+++ b/theme-compiler/src/com/vaadin/sass/internal/tree/BlockNode.java
@@ -17,6 +17,8 @@
 package com.vaadin.sass.internal.tree;
 
 import java.util.ArrayList;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 import com.vaadin.sass.internal.ScssStylesheet;
 import com.vaadin.sass.internal.visitor.BlockNodeHandler;
@@ -109,7 +111,8 @@ public class BlockNode extends Node implements IVariableNode {
             BlockNodeHandler.traverse(this);
             replaceVariables(ScssStylesheet.getVariables());
         } catch (Exception e) {
-            e.printStackTrace();
+            Logger.getLogger(BlockNode.class.getName()).log(Level.SEVERE, null,
+                    e);
         }
     }
 
diff --git a/theme-compiler/src/com/vaadin/sass/internal/tree/ExtendNode.java b/theme-compiler/src/com/vaadin/sass/internal/tree/ExtendNode.java
index 417849d13b..dcabd2ff01 100644
--- a/theme-compiler/src/com/vaadin/sass/internal/tree/ExtendNode.java
+++ b/theme-compiler/src/com/vaadin/sass/internal/tree/ExtendNode.java
@@ -17,6 +17,8 @@
 package com.vaadin.sass.internal.tree;
 
 import java.util.ArrayList;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 import com.vaadin.sass.internal.visitor.ExtendNodeHandler;
 
@@ -54,7 +56,8 @@ public class ExtendNode extends Node implements IVariableNode {
             ExtendNodeHandler.traverse(this);
             getParentNode().removeChild(this);
         } catch (Exception e) {
-            e.printStackTrace();
+            Logger.getLogger(ExtendNode.class.getName()).log(Level.SEVERE,
+                    null, e);
         }
     }
 }
diff --git a/theme-compiler/src/com/vaadin/sass/internal/tree/MixinNode.java b/theme-compiler/src/com/vaadin/sass/internal/tree/MixinNode.java
index e702bc8577..c5ffb6d73d 100644
--- a/theme-compiler/src/com/vaadin/sass/internal/tree/MixinNode.java
+++ b/theme-compiler/src/com/vaadin/sass/internal/tree/MixinNode.java
@@ -19,6 +19,8 @@ package com.vaadin.sass.internal.tree;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Map;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 import com.vaadin.sass.internal.ScssStylesheet;
 import com.vaadin.sass.internal.parser.LexicalUnitImpl;
@@ -119,7 +121,8 @@ public class MixinNode extends Node implements IVariableNode {
             ScssStylesheet.closeVariableScope(variableScope);
 
         } catch (Exception e) {
-            e.printStackTrace();
+            Logger.getLogger(MixinNode.class.getName()).log(Level.SEVERE, null,
+                    e);
         }
     }
 
diff --git a/theme-compiler/src/com/vaadin/sass/internal/tree/controldirective/IfElseDefNode.java b/theme-compiler/src/com/vaadin/sass/internal/tree/controldirective/IfElseDefNode.java
index 735d83a898..8449a9d891 100644
--- a/theme-compiler/src/com/vaadin/sass/internal/tree/controldirective/IfElseDefNode.java
+++ b/theme-compiler/src/com/vaadin/sass/internal/tree/controldirective/IfElseDefNode.java
@@ -15,6 +15,9 @@
  */
 package com.vaadin.sass.internal.tree.controldirective;
 
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
 import com.vaadin.sass.internal.tree.Node;
 import com.vaadin.sass.internal.visitor.IfElseNodeHandler;
 
@@ -40,7 +43,8 @@ public class IfElseDefNode extends Node {
 
             IfElseNodeHandler.traverse(this);
         } catch (Exception e) {
-            e.printStackTrace();
+            Logger.getLogger(IfElseDefNode.class.getName()).log(Level.SEVERE,
+                    null, e);
         }
     }
 
diff --git a/theme-compiler/src/com/vaadin/sass/internal/util/DeepCopy.java b/theme-compiler/src/com/vaadin/sass/internal/util/DeepCopy.java
index bc30ffdd6c..af66eb9a74 100644
--- a/theme-compiler/src/com/vaadin/sass/internal/util/DeepCopy.java
+++ b/theme-compiler/src/com/vaadin/sass/internal/util/DeepCopy.java
@@ -22,13 +22,15 @@ import java.io.ObjectOutputStream;
 import java.util.Collection;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 /**
  * Utility for making deep copies (vs. clone()'s shallow copies) of objects.
  * Objects are first serialized and then deserialized. Error checking is fairly
  * minimal in this implementation. If an object is encountered that cannot be
  * serialized (or that references an object that cannot be serialized) an error
- * is printed to System.err and null is returned. Depending on your specific
+ * is printed to the logger and null is returned. Depending on your specific
  * application, it might make more sense to have copy(...) re-throw the
  * exception.
  */
@@ -56,9 +58,9 @@ public class DeepCopy {
                 obj = in.readObject();
                 in.close();
             } catch (IOException e) {
-                e.printStackTrace();
+                log(e);
             } catch (ClassNotFoundException cnfe) {
-                cnfe.printStackTrace();
+                log(cnfe);
             }
             return obj;
         } else {
@@ -80,4 +82,8 @@ public class DeepCopy {
         }
         return copies;
     }
+
+    private static void log(Throwable e) {
+        Logger.getLogger(DeepCopy.class.getName()).log(Level.SEVERE, null, e);
+    }
 }
\ No newline at end of file
diff --git a/theme-compiler/src/com/vaadin/sass/internal/visitor/ImportNodeHandler.java b/theme-compiler/src/com/vaadin/sass/internal/visitor/ImportNodeHandler.java
index e52767bb5a..daf01a3eab 100644
--- a/theme-compiler/src/com/vaadin/sass/internal/visitor/ImportNodeHandler.java
+++ b/theme-compiler/src/com/vaadin/sass/internal/visitor/ImportNodeHandler.java
@@ -19,6 +19,8 @@ package com.vaadin.sass.internal.visitor;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 import org.w3c.css.sac.CSSException;
 import org.w3c.css.sac.LexicalUnit;
@@ -78,9 +80,11 @@ public class ImportNodeHandler {
                                 importNode);
                         node.removeChild(importNode);
                     } catch (CSSException e) {
-                        e.printStackTrace();
+                        Logger.getLogger(ImportNodeHandler.class.getName())
+                                .log(Level.SEVERE, null, e);
                     } catch (IOException e) {
-                        e.printStackTrace();
+                        Logger.getLogger(ImportNodeHandler.class.getName())
+                                .log(Level.SEVERE, null, e);
                     }
                 } else {
                     if (styleSheet != node) {
diff --git a/theme-compiler/src/logging.properties b/theme-compiler/src/logging.properties
new file mode 100644
index 0000000000..b563d4b68e
--- /dev/null
+++ b/theme-compiler/src/logging.properties
@@ -0,0 +1,2 @@
+handlers = com.vaadin.sass.CustomConsoleHandler
+.level = ALL
\ No newline at end of file