add support for finding the console's charset, LOGBACK-1642

Signed-off-by: Ceki Gulcu <ceki@qos.ch>

Author: ceki

logback-classic/src/test/input/joran/consoleCharset.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!--
+  ~ Logback: the reliable, generic, fast and flexible logging framework.
+  ~ Copyright (C) 1999-2024, QOS.ch. All rights reserved.
+  ~
+  ~ This program and the accompanying materials are dual-licensed under
+  ~ either the terms of the Eclipse Public License v1.0 as published by
+  ~ the Eclipse Foundation
+  ~
+  ~   or (per the licensee's choosing)
+  ~
+  ~ under the terms of the GNU Lesser General Public License version 2.1
+  ~ as published by the Free Software Foundation.
+  -->
+
+<!DOCTYPE configuration>
+
+<configuration>
+    <import class="ch.qos.logback.core.status.OnConsoleStatusListener"/>
+    <import class="ch.qos.logback.classic.encoder.PatternLayoutEncoder"/>
+    <import class="ch.qos.logback.core.ConsoleAppender"/>
+    <import class="ch.qos.logback.core.property.ConsoleCharsetPropertyDefiner"/>
+
+    <define name="consoleCharset" class="ConsoleCharsetPropertyDefiner"/>
+
+    <appender name="CON" class="ConsoleAppender">
+        <encoder class="PatternLayoutEncoder">
+            <charset>${consoleCharset}</charset>
+            <pattern>TEST %d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root>
+        <level value="DEBUG"/>
+        <appender-ref ref="CON"/>
+    </root>
+    <statusListener class="OnConsoleStatusListener"/>
+</configuration>

logback-classic/src/test/java/ch/qos/logback/classic/joran/JoranConfiguratorTest.java

@@ -46,6 +46,7 @@
 import ch.qos.logback.core.testUtil.RandomUtil;
 import ch.qos.logback.core.testUtil.StringListAppender;
 import ch.qos.logback.core.util.CachingDateFormatter;
+import ch.qos.logback.core.util.EnvUtil;
 import ch.qos.logback.core.util.StatusPrinter;
 import ch.qos.logback.core.util.StatusPrinter2;
 import org.junit.jupiter.api.Disabled;
@@ -740,6 +741,18 @@ public void dateConverterWithLocale() throws JoranException  {
         //StatusPrinter.print(loggerContext);
     }
 
+    @Test
+    public void consoleCharsetTest() throws JoranException  {
+        if(EnvUtil.isJDK21OrHigher()) {
+            configure(ClassicTestConstants.JORAN_INPUT_PREFIX + "consoleCharset.xml");
+            checker.assertContainsMatch(Status.INFO, "About to instantiate property definer of type \\[ch.qos.logback.core.property.ConsoleCharsetPropertyDefiner\\]");
+            checker.assertContainsMatch(Status.WARN, "System.console\\(\\) returned null. Cannot compute console's charset, returning");
+            checker.assertContainsMatch("Setting property consoleCharset=null in scope LOCAL" );
+            checker.assertContainsMatch("Converting the string \\\"null. as Charset.defaultCharset\\(\\)");
+            //StatusPrinter.print(loggerContext);
+        }
+    }
+
     @Test
     public void modelSerialization() throws JoranException, IOException, ClassNotFoundException {
         String outputPath = OUTPUT_DIR_PREFIX+"minimal_"+diff+ MODEL_CONFIG_FILE_EXTENSION;

logback-core/pom.xml

@@ -102,6 +102,16 @@
                             <multiReleaseOutput>true</multiReleaseOutput>
                         </configuration>
                     </execution>
+
+                    <execution>
+                        <id>default-testCompile</id>
+                        <phase>test-compile</phase>
+                        <configuration>
+                            <testExcludes>
+                                <exclude>**/COWArrayListConcurrencyTest.java</exclude>
+                            </testExcludes>
+                        </configuration>
+                    </execution>
                 </executions>
             </plugin>
             <plugin>

logback-core/src/main/java/ch/qos/logback/core/encoder/LayoutWrappingEncoder.java

@@ -27,7 +27,7 @@ public class LayoutWrappingEncoder<E> extends EncoderBase<E> {
     /**
      * The charset to use when converting a String into bytes.
      * <p>
-     * By default this property has the value {@code null} which corresponds to the
+     * By default, this property has the value {@code null} which corresponds to the
      * system's default charset.
      */
     private Charset charset;
@@ -51,7 +51,7 @@ public Charset getCharset() {
      * Set the charset to use when converting the string returned by the layout into
      * bytes.
      * <p>
-     * By default this property has the value {@code null} which corresponds to the
+     * By default, this property has the value {@code null} which corresponds to the
      * system's default charset.
      *
      * @param charset

logback-core/src/main/java/ch/qos/logback/core/joran/JoranConstants.java

@@ -13,6 +13,8 @@
  */
 package ch.qos.logback.core.joran;
 
+import ch.qos.logback.core.CoreConstants;
+
 /**
  *
  * This class contains constants used by Joran components.
@@ -37,7 +39,8 @@ public abstract class JoranConstants {
     public static final String ACTION_CLASS_ATTRIBUTE = "actionClass";
 
     public static final String INHERITED = "INHERITED";
-    public static final String NULL = "NULL";
+    // all usages in the project are case-insensitive. Elsewhere this might not be the case hence the toUpperCase call
+    public static final String NULL = CoreConstants.NULL_STR.toUpperCase();
     static final Class<?>[] ONE_STRING_PARAM = new Class[] { String.class };
 
     public static final String APPENDER_BAG = "APPENDER_BAG";

logback-core/src/main/java/ch/qos/logback/core/joran/util/PropertySetter.java

@@ -285,8 +285,4 @@ public Class<?> getClassNameViaImplicitRules(String name, AggregationType aggreg
         return aggregationAssessor.getClassNameViaImplicitRules(name, aggregationType, registry);
     }
 
-
-
-
-
-    }
+}

logback-core/src/main/java/ch/qos/logback/core/joran/util/StringToObjectConverter.java

@@ -13,21 +13,27 @@
  */
 package ch.qos.logback.core.joran.util;
 
+import java.io.Console;
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
 import java.nio.charset.Charset;
 import java.nio.charset.UnsupportedCharsetException;
 
+import ch.qos.logback.core.Context;
 import ch.qos.logback.core.CoreConstants;
 import ch.qos.logback.core.spi.ContextAware;
+import ch.qos.logback.core.spi.ContextAwareBase;
+
+import static ch.qos.logback.core.CoreConstants.CONSOLE;
+import static ch.qos.logback.core.CoreConstants.NULL_STR;
 
 /**
  * Utility class which can convert string into objects.
  * 
  * @author Ceki Gülcü
  *
  */
-public class StringToObjectConverter {
+public class StringToObjectConverter  {
 
     private static final Class<?>[] STRING_CLASS_PARAMETER = new Class[] { String.class };
 
@@ -51,7 +57,7 @@ static public boolean canBeBuiltFromSimpleString(Class<?> parameterClass) {
      * Convert <code>val</code> a String parameter to an object of a given type.
      */
     @SuppressWarnings("unchecked")
-    public static Object convertArg(ContextAware ca, String val, Class<?> type) {
+    static public Object convertArg(ContextAware ca, String val, Class<?> type) {
         if (val == null) {
             return null;
         }
@@ -88,6 +94,12 @@ static private boolean isOfTypeCharset(Class<?> type) {
     }
 
     static private Charset convertToCharset(ContextAware ca, String val) {
+
+        if (NULL_STR.equalsIgnoreCase(val)) {
+            ca.addInfo("Converting the string \"null\" as Charset.defaultCharset()");
+            return Charset.defaultCharset();
+        }
+
         try {
             return Charset.forName(val);
         } catch (UnsupportedCharsetException e) {

logback-core/src/main/java21/ch/qos/logback/core/property/ConsoleCharsetPropertyDefiner.java

@@ -0,0 +1,49 @@
+/*
+ * Logback: the reliable, generic, fast and flexible logging framework.
+ * Copyright (C) 1999-2024, QOS.ch. All rights reserved.
+ *
+ * This program and the accompanying materials are dual-licensed under
+ * either the terms of the Eclipse Public License v1.0 as published by
+ * the Eclipse Foundation
+ *
+ *   or (per the licensee's choosing)
+ *
+ * under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation.
+ */
+
+package ch.qos.logback.core.property;
+
+import ch.qos.logback.core.PropertyDefinerBase;
+import static ch.qos.logback.core.CoreConstants.NULL_STR;
+
+import java.io.Console;
+import java.nio.charset.Charset;
+
+/**
+ * Compute the console's charset.
+ *
+ * @since 1.5.7
+ */
+public class ConsoleCharsetPropertyDefiner extends PropertyDefinerBase {
+    @Override
+    public String getPropertyValue() {
+        // System.console().charset() requires Java 17
+        Console console = System.console();
+        if (console != null) {
+            Charset charset = console.charset();
+            if (charset != null) {
+                String charsetName = charset.name();
+                addInfo("Found value '" + charsetName + "' as returned by System.console().");
+                return charsetName;
+            } else {
+                addInfo("System.console() returned null charset. Returning \"NULL\" string as defined value.");
+                return NULL_STR;
+            }
+        } else {
+            addWarn("System.console() returned null. Cannot compute console's charset, returning the \"NULL\" string, i.e. the default JVM charset");
+            return NULL_STR;
+        }
+    }
+
+}