diff --git a/designer-base/src/main/java/com/fr/env/detect/impl/converter/ClassConflictConvertor.java b/designer-base/src/main/java/com/fr/env/detect/impl/converter/ClassConflictConvertor.java
index ef5be1339..b1f9e507d 100644
--- a/designer-base/src/main/java/com/fr/env/detect/impl/converter/ClassConflictConvertor.java
+++ b/designer-base/src/main/java/com/fr/env/detect/impl/converter/ClassConflictConvertor.java
@@ -41,6 +41,8 @@ public class ClassConflictConvertor implements ThrowableConverter {
      */
     private static final Pattern JAR_NAME_PATTERN = Pattern.compile("([\\w+-\\.]*\\.jar)");
     
+    private static final String WEB_INF_STRING = "WEB-INF";
+    
     private final Map<Class<?>, ClassNameConverter> throwableMap = new HashMap<>();
     
     public ClassConflictConvertor() {
@@ -103,7 +105,7 @@ public class ClassConflictConvertor implements ThrowableConverter {
                     if (matcher.find()) {
                         String jar = matcher.group();
                         List<String> libPath = null;
-                        if (file.contains("WEB-INF")) {
+                        if (file.contains(WEB_INF_STRING)) {
                             libPath = libMap.get(DetectorConstants.WEB_LIB_PATH);
                         } else {
                             libPath = libMap.get(DetectorConstants.FR_HOME_LIB);