diff --git a/src/main/assemblies/files/fess.in.bat b/src/main/assemblies/files/fess.in.bat
index 104ff411a..429e3c1ae 100644
--- a/src/main/assemblies/files/fess.in.bat
+++ b/src/main/assemblies/files/fess.in.bat
@@ -66,6 +66,7 @@ set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dio.netty.recycler.maxCapacityPerThread=0
 
 set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dlog4j.shutdownHookEnabled=false
 set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dlog4j2.disable.jmx=true
+set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dlog4j2.formatMsgNoLookups=true
 set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dlog4j.skipJansi=true
 
 REM SSL truststore for certificate validation over https
diff --git a/src/main/assemblies/files/fess.in.sh b/src/main/assemblies/files/fess.in.sh
index 51da4506d..b73c5393e 100755
--- a/src/main/assemblies/files/fess.in.sh
+++ b/src/main/assemblies/files/fess.in.sh
@@ -64,6 +64,7 @@ FESS_JAVA_OPTS="$FESS_JAVA_OPTS -Dio.netty.recycler.maxCapacityPerThread=0"
 
 FESS_JAVA_OPTS="$FESS_JAVA_OPTS -Dlog4j.shutdownHookEnabled=false"
 FESS_JAVA_OPTS="$FESS_JAVA_OPTS -Dlog4j2.disable.jmx=true"
+FESS_JAVA_OPTS="$FESS_JAVA_OPTS -Dlog4j2.formatMsgNoLookups=true"
 FESS_JAVA_OPTS="$FESS_JAVA_OPTS -Dlog4j.skipJansi=true"
 
 # Causes the JVM to dump its heap on OutOfMemory.
diff --git a/src/main/java/org/codelibs/fess/mylasta/direction/FessConfig.java b/src/main/java/org/codelibs/fess/mylasta/direction/FessConfig.java
index 5b8fb4bfe..d07257e95 100644
--- a/src/main/java/org/codelibs/fess/mylasta/direction/FessConfig.java
+++ b/src/main/java/org/codelibs/fess/mylasta/direction/FessConfig.java
@@ -86,6 +86,7 @@ public interface FessConfig extends FessEnv, org.codelibs.fess.mylasta.direction
     -Dio.netty.noKeySetOptimization=true
     -Dio.netty.recycler.maxCapacityPerThread=0
     -Dlog4j.shutdownHookEnabled=false
+    -Dlog4j2.formatMsgNoLookups=true
     -Dlog4j2.disable.jmx=true
     -Dlog4j.skipJansi=true
     -Dsun.java2d.cmm=sun.java2d.cmm.kcms.KcmsServiceProvider
@@ -119,6 +120,7 @@ public interface FessConfig extends FessEnv, org.codelibs.fess.mylasta.direction
     -Dio.netty.recycler.maxCapacityPerThread=0
     -Dlog4j.shutdownHookEnabled=false
     -Dlog4j2.disable.jmx=true
+    -Dlog4j2.formatMsgNoLookups=true
     -Dlog4j.skipJansi=true
     */
     String JVM_SUGGEST_OPTIONS = "jvm.suggest.options";
@@ -157,6 +159,7 @@ public interface FessConfig extends FessEnv, org.codelibs.fess.mylasta.direction
     -Dio.netty.recycler.maxCapacityPerThread=0
     -Dlog4j.shutdownHookEnabled=false
     -Dlog4j2.disable.jmx=true
+    -Dlog4j2.formatMsgNoLookups=true
     -Dlog4j.skipJansi=true
     -Dsun.java2d.cmm=sun.java2d.cmm.kcms.KcmsServiceProvider
     -Dorg.apache.pdfbox.rendering.UsePureJavaCMYKConversion=true
@@ -1864,6 +1867,7 @@ public interface FessConfig extends FessEnv, org.codelibs.fess.mylasta.direction
     -Dio.netty.noKeySetOptimization=true
     -Dio.netty.recycler.maxCapacityPerThread=0
     -Dlog4j.shutdownHookEnabled=false
+    -Dlog4j2.formatMsgNoLookups=true
     -Dlog4j2.disable.jmx=true
     -Dlog4j.skipJansi=true
     -Dsun.java2d.cmm=sun.java2d.cmm.kcms.KcmsServiceProvider
@@ -1902,6 +1906,7 @@ public interface FessConfig extends FessEnv, org.codelibs.fess.mylasta.direction
     -Dio.netty.recycler.maxCapacityPerThread=0
     -Dlog4j.shutdownHookEnabled=false
     -Dlog4j2.disable.jmx=true
+    -Dlog4j2.formatMsgNoLookups=true
     -Dlog4j.skipJansi=true
     <br>
      * @return The value of found property. (NotNull: if not found, exception but basically no way)
@@ -1944,6 +1949,7 @@ public interface FessConfig extends FessEnv, org.codelibs.fess.mylasta.direction
     -Dio.netty.recycler.maxCapacityPerThread=0
     -Dlog4j.shutdownHookEnabled=false
     -Dlog4j2.disable.jmx=true
+    -Dlog4j2.formatMsgNoLookups=true
     -Dlog4j.skipJansi=true
     -Dsun.java2d.cmm=sun.java2d.cmm.kcms.KcmsServiceProvider
     -Dorg.apache.pdfbox.rendering.UsePureJavaCMYKConversion=true
@@ -10070,11 +10076,11 @@ public interface FessConfig extends FessEnv, org.codelibs.fess.mylasta.direction
             defaultMap.put(FessConfig.APP_ENCRYPT_PROPERTY_PATTERN, ".*password|.*key|.*token|.*secret");
             defaultMap.put(FessConfig.APP_EXTENSION_NAMES, "");
             defaultMap.put(FessConfig.JVM_CRAWLER_OPTIONS,
-                    "-Djava.awt.headless=true\n-Dfile.encoding=UTF-8\n-Djna.nosys=true\n-Djdk.io.permissionsUseCanonicalPath=true\n-Dhttp.maxConnections=20\n-Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager\n-server\n-Xms128m\n-Xmx512m\n-XX:MaxMetaspaceSize=128m\n-XX:CompressedClassSpaceSize=32m\n-XX:-UseGCOverheadLimit\n-XX:+UseTLAB\n-XX:+DisableExplicitGC\n-XX:-HeapDumpOnOutOfMemoryError\n-XX:-OmitStackTraceInFastThrow\n-XX:+UnlockExperimentalVMOptions\n-XX:+UseG1GC\n-XX:InitiatingHeapOccupancyPercent=45\n-XX:G1HeapRegionSize=1m\n-XX:MaxGCPauseMillis=60000\n-XX:G1NewSizePercent=5\n-XX:G1MaxNewSizePercent=5\n-Djcifs.smb.client.responseTimeout=30000\n-Djcifs.smb.client.soTimeout=35000\n-Djcifs.smb.client.connTimeout=60000\n-Djcifs.smb.client.sessionTimeout=60000\n-Djcifs.smb1.smb.client.connTimeout=60000\n-Djcifs.smb1.smb.client.soTimeout=35000\n-Djcifs.smb1.smb.client.responseTimeout=30000\n-Dio.netty.noUnsafe=true\n-Dio.netty.noKeySetOptimization=true\n-Dio.netty.recycler.maxCapacityPerThread=0\n-Dlog4j.shutdownHookEnabled=false\n-Dlog4j2.disable.jmx=true\n-Dlog4j.skipJansi=true\n-Dsun.java2d.cmm=sun.java2d.cmm.kcms.KcmsServiceProvider\n-Dorg.apache.pdfbox.rendering.UsePureJavaCMYKConversion=true\n");
+                    "-Djava.awt.headless=true\n-Dfile.encoding=UTF-8\n-Djna.nosys=true\n-Djdk.io.permissionsUseCanonicalPath=true\n-Dhttp.maxConnections=20\n-Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager\n-server\n-Xms128m\n-Xmx512m\n-XX:MaxMetaspaceSize=128m\n-XX:CompressedClassSpaceSize=32m\n-XX:-UseGCOverheadLimit\n-XX:+UseTLAB\n-XX:+DisableExplicitGC\n-XX:-HeapDumpOnOutOfMemoryError\n-XX:-OmitStackTraceInFastThrow\n-XX:+UnlockExperimentalVMOptions\n-XX:+UseG1GC\n-XX:InitiatingHeapOccupancyPercent=45\n-XX:G1HeapRegionSize=1m\n-XX:MaxGCPauseMillis=60000\n-XX:G1NewSizePercent=5\n-XX:G1MaxNewSizePercent=5\n-Djcifs.smb.client.responseTimeout=30000\n-Djcifs.smb.client.soTimeout=35000\n-Djcifs.smb.client.connTimeout=60000\n-Djcifs.smb.client.sessionTimeout=60000\n-Djcifs.smb1.smb.client.connTimeout=60000\n-Djcifs.smb1.smb.client.soTimeout=35000\n-Djcifs.smb1.smb.client.responseTimeout=30000\n-Dio.netty.noUnsafe=true\n-Dio.netty.noKeySetOptimization=true\n-Dio.netty.recycler.maxCapacityPerThread=0\n-Dlog4j.shutdownHookEnabled=false\n-Dlog4j2.formatMsgNoLookups=true\n-Dlog4j2.disable.jmx=true\n-Dlog4j.skipJansi=true\n-Dsun.java2d.cmm=sun.java2d.cmm.kcms.KcmsServiceProvider\n-Dorg.apache.pdfbox.rendering.UsePureJavaCMYKConversion=true\n");
             defaultMap.put(FessConfig.JVM_SUGGEST_OPTIONS,
-                    "-Djava.awt.headless=true\n-Dfile.encoding=UTF-8\n-Djna.nosys=true\n-Djdk.io.permissionsUseCanonicalPath=true\n-Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager\n-server\n-Xms128m\n-Xmx256m\n-XX:MaxMetaspaceSize=128m\n-XX:CompressedClassSpaceSize=32m\n-XX:-UseGCOverheadLimit\n-XX:+UseTLAB\n-XX:+DisableExplicitGC\n-XX:-HeapDumpOnOutOfMemoryError\n-XX:+UnlockExperimentalVMOptions\n-XX:+UseG1GC\n-XX:InitiatingHeapOccupancyPercent=45\n-XX:G1HeapRegionSize=1m\n-XX:MaxGCPauseMillis=60000\n-XX:G1NewSizePercent=5\n-XX:G1MaxNewSizePercent=30\n-Dio.netty.noUnsafe=true\n-Dio.netty.noKeySetOptimization=true\n-Dio.netty.recycler.maxCapacityPerThread=0\n-Dlog4j.shutdownHookEnabled=false\n-Dlog4j2.disable.jmx=true\n-Dlog4j.skipJansi=true\n");
+                    "-Djava.awt.headless=true\n-Dfile.encoding=UTF-8\n-Djna.nosys=true\n-Djdk.io.permissionsUseCanonicalPath=true\n-Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager\n-server\n-Xms128m\n-Xmx256m\n-XX:MaxMetaspaceSize=128m\n-XX:CompressedClassSpaceSize=32m\n-XX:-UseGCOverheadLimit\n-XX:+UseTLAB\n-XX:+DisableExplicitGC\n-XX:-HeapDumpOnOutOfMemoryError\n-XX:+UnlockExperimentalVMOptions\n-XX:+UseG1GC\n-XX:InitiatingHeapOccupancyPercent=45\n-XX:G1HeapRegionSize=1m\n-XX:MaxGCPauseMillis=60000\n-XX:G1NewSizePercent=5\n-XX:G1MaxNewSizePercent=30\n-Dio.netty.noUnsafe=true\n-Dio.netty.noKeySetOptimization=true\n-Dio.netty.recycler.maxCapacityPerThread=0\n-Dlog4j.shutdownHookEnabled=false\n-Dlog4j2.disable.jmx=true\n-Dlog4j2.formatMsgNoLookups=true\n-Dlog4j.skipJansi=true\n");
             defaultMap.put(FessConfig.JVM_THUMBNAIL_OPTIONS,
-                    "-Djava.awt.headless=true\n-Dfile.encoding=UTF-8\n-Djna.nosys=true\n-Djdk.io.permissionsUseCanonicalPath=true\n-Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager\n-server\n-Xms128m\n-Xmx256m\n-XX:MaxMetaspaceSize=128m\n-XX:CompressedClassSpaceSize=32m\n-XX:-UseGCOverheadLimit\n-XX:+UseTLAB\n-XX:+DisableExplicitGC\n-XX:-HeapDumpOnOutOfMemoryError\n-XX:-OmitStackTraceInFastThrow\n-XX:+UnlockExperimentalVMOptions\n-XX:+UseG1GC\n-XX:InitiatingHeapOccupancyPercent=45\n-XX:G1HeapRegionSize=4m\n-XX:MaxGCPauseMillis=60000\n-XX:G1NewSizePercent=5\n-XX:G1MaxNewSizePercent=50\n-Djcifs.smb.client.responseTimeout=30000\n-Djcifs.smb.client.soTimeout=35000\n-Djcifs.smb.client.connTimeout=60000\n-Djcifs.smb.client.sessionTimeout=60000\n-Djcifs.smb1.smb.client.connTimeout=60000\n-Djcifs.smb1.smb.client.soTimeout=35000\n-Djcifs.smb1.smb.client.responseTimeout=30000\n-Dio.netty.noUnsafe=true\n-Dio.netty.noKeySetOptimization=true\n-Dio.netty.recycler.maxCapacityPerThread=0\n-Dlog4j.shutdownHookEnabled=false\n-Dlog4j2.disable.jmx=true\n-Dlog4j.skipJansi=true\n-Dsun.java2d.cmm=sun.java2d.cmm.kcms.KcmsServiceProvider\n-Dorg.apache.pdfbox.rendering.UsePureJavaCMYKConversion=true\n");
+                    "-Djava.awt.headless=true\n-Dfile.encoding=UTF-8\n-Djna.nosys=true\n-Djdk.io.permissionsUseCanonicalPath=true\n-Djava.util.logging.manager=org.apache.logging.log4j.jul.LogManager\n-server\n-Xms128m\n-Xmx256m\n-XX:MaxMetaspaceSize=128m\n-XX:CompressedClassSpaceSize=32m\n-XX:-UseGCOverheadLimit\n-XX:+UseTLAB\n-XX:+DisableExplicitGC\n-XX:-HeapDumpOnOutOfMemoryError\n-XX:-OmitStackTraceInFastThrow\n-XX:+UnlockExperimentalVMOptions\n-XX:+UseG1GC\n-XX:InitiatingHeapOccupancyPercent=45\n-XX:G1HeapRegionSize=4m\n-XX:MaxGCPauseMillis=60000\n-XX:G1NewSizePercent=5\n-XX:G1MaxNewSizePercent=50\n-Djcifs.smb.client.responseTimeout=30000\n-Djcifs.smb.client.soTimeout=35000\n-Djcifs.smb.client.connTimeout=60000\n-Djcifs.smb.client.sessionTimeout=60000\n-Djcifs.smb1.smb.client.connTimeout=60000\n-Djcifs.smb1.smb.client.soTimeout=35000\n-Djcifs.smb1.smb.client.responseTimeout=30000\n-Dio.netty.noUnsafe=true\n-Dio.netty.noKeySetOptimization=true\n-Dio.netty.recycler.maxCapacityPerThread=0\n-Dlog4j.shutdownHookEnabled=false\n-Dlog4j2.disable.jmx=true\n-Dlog4j2.formatMsgNoLookups=true\n-Dlog4j.skipJansi=true\n-Dsun.java2d.cmm=sun.java2d.cmm.kcms.KcmsServiceProvider\n-Dorg.apache.pdfbox.rendering.UsePureJavaCMYKConversion=true\n");
             defaultMap.put(FessConfig.JOB_SYSTEM_JOB_IDS, "default_crawler");
             defaultMap.put(FessConfig.JOB_TEMPLATE_TITLE_WEB, "Web Crawler - {0}");
             defaultMap.put(FessConfig.JOB_TEMPLATE_TITLE_FILE, "File Crawler - {0}");
diff --git a/src/main/resources/fess_config.properties b/src/main/resources/fess_config.properties
index 3ec103369..3063637d2 100644
--- a/src/main/resources/fess_config.properties
+++ b/src/main/resources/fess_config.properties
@@ -58,6 +58,7 @@ jvm.crawler.options=\
 -Dio.netty.noKeySetOptimization=true\n\
 -Dio.netty.recycler.maxCapacityPerThread=0\n\
 -Dlog4j.shutdownHookEnabled=false\n\
+-Dlog4j2.formatMsgNoLookups=true\n\
 -Dlog4j2.disable.jmx=true\n\
 -Dlog4j.skipJansi=true\n\
 -Dsun.java2d.cmm=sun.java2d.cmm.kcms.KcmsServiceProvider\n\
@@ -91,6 +92,7 @@ jvm.suggest.options=\
 -Dio.netty.recycler.maxCapacityPerThread=0\n\
 -Dlog4j.shutdownHookEnabled=false\n\
 -Dlog4j2.disable.jmx=true\n\
+-Dlog4j2.formatMsgNoLookups=true\n\
 -Dlog4j.skipJansi=true\n\
 
 
@@ -129,6 +131,7 @@ jvm.thumbnail.options=\
 -Dio.netty.recycler.maxCapacityPerThread=0\n\
 -Dlog4j.shutdownHookEnabled=false\n\
 -Dlog4j2.disable.jmx=true\n\
+-Dlog4j2.formatMsgNoLookups=true\n\
 -Dlog4j.skipJansi=true\n\
 -Dsun.java2d.cmm=sun.java2d.cmm.kcms.KcmsServiceProvider\n\
 -Dorg.apache.pdfbox.rendering.UsePureJavaCMYKConversion=true\n\