[LOG4J2-1920 ]ScriptEngineManager is not available in Android and causes

a NoClassDefFoundError. 'mvn clean install' builds.

log4j-core/src/main/java/org/apache/logging/log4j/core/config/AbstractConfiguration.java

@@ -211,7 +211,12 @@ public abstract class AbstractConfiguration extends AbstractFilterable implement
     public void initialize() {
         LOGGER.debug("Initializing configuration {}", this);
         subst.setConfiguration(this);
-        scriptManager = new ScriptManager(this, watchManager);
+        try {
+            scriptManager = new ScriptManager(this, watchManager);
+        } catch (final LinkageError | Exception e) {
+            // LOG4J2-1920 ScriptEngineManager is not available in Android
+            LOGGER.info("Cannot initialize scripting support because this JRE does not support it.", e);
+        }
         pluginManager.collectPlugins(pluginPackages);
         final PluginManager levelPlugins = new PluginManager(Level.CATEGORY);
         levelPlugins.collectPlugins(pluginPackages);
@@ -515,8 +520,9 @@ public abstract class AbstractConfiguration extends AbstractFilterable implement
                         LOGGER.error("Script reference to {} not added. Scripts definition cannot contain script references",
                                 script.getName());
                     } else {
-                        scriptManager.addScript(script);
-                    }
+                        if (scriptManager != null) {
+                            scriptManager.addScript(script);
+                        }}
                 }
             } else if (child.getName().equalsIgnoreCase("Appenders")) {
                 appenders = child.getObject();

log4j-core/src/test/java/org/apache/logging/log4j/core/net/ssl/SslConfigurationTest.java

@@ -31,7 +31,12 @@ public class SslConfigurationTest {
     private static final int TLS_TEST_PORT = 443;
 
     @Test
-    public void emptyConfigurationDoesntCauseNullSSLSocketFactory() {
+    public void equals() {
+        Assert.assertEquals(SslConfiguration.createSSLConfiguration(null, null, null), SslConfiguration.createSSLConfiguration(null, null, null));
+    }
+    
+    @Test
+        public void emptyConfigurationDoesntCauseNullSSLSocketFactory() {
         final SslConfiguration sc = SslConfiguration.createSSLConfiguration(null, null, null);
         final SSLSocketFactory factory = sc.getSslSocketFactory();
         Assert.assertNotNull(factory);

src/changes/changes.xml

@@ -61,6 +61,9 @@
       <action issue="LOG4J2-1885" dev="mattsicker" type="fix">
         Fix documentation about default additivity value for loggers.
       </action>
+      <action issue="LOG4J2-1920" dev="ggregory" type="fix" due-to="Ajitha">
+        ScriptEngineManager is not available in Android and causes a NoClassDefFoundError.
+      </action>
       <action issue="LOG4J2-1851" dev="mikes" type="update">
         Move server components from log4j-core to new log4-server module.
       </action>