GitHub Issue 796: JSON logging stopped after Tomcat/Spring update (#1265)

Author: labkey-jeckels

server/embedded/src/org/labkey/embedded/LabKeyServer.java

@@ -15,6 +15,7 @@
 
 import java.io.File;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -92,6 +93,32 @@ public static void main(String[] args)
 
         application.setDefaultProperties(new HashMap<>()
              {{
+                // GitHub Issue 796: JSON logging stopped after Tomcat/Spring update
+                 // Propagate log4j configuration to Spring Boot config, which is necessary with Spring Boot 4.x
+                 String log4JConfig = System.getProperty("log4j.configurationFile");
+                 if (log4JConfig != null)
+                 {
+                     String[] log4JConfigParts = log4JConfig.split(",");
+                     if (log4JConfigParts.length > 0)
+                     {
+                         if ("log4j2.xml".equals(log4JConfigParts[0]))
+                         {
+                             // Assume this is the one packaged with our embedded build and on the classpath
+                             put("logging.config", "classpath:log4j2.xml");
+                         }
+                         else
+                         {
+                             put("logging.config", log4JConfigParts[0]);
+                         }
+                         if (log4JConfigParts.length > 1)
+                         {
+                            put("logging.log4j2.config.override", String.join(",", Arrays.asList(log4JConfigParts).subList(1, log4JConfigParts.length)));
+                         }
+                         else
+                             throw new IllegalArgumentException("log4j.configurationFile must be in the form log4j2.xml[,secondaryFile]");
+                     }
+                 }
+
                  put("server.tomcat.basedir", ".");
                  put("server.tomcat.accesslog.directory", logHome);