diff --git a/dongtai-core/src/main/java/io/dongtai/iast/core/handler/hookpoint/models/MethodEvent.java b/dongtai-core/src/main/java/io/dongtai/iast/core/handler/hookpoint/models/MethodEvent.java
index 7ee75dd02..08d4be826 100644
--- a/dongtai-core/src/main/java/io/dongtai/iast/core/handler/hookpoint/models/MethodEvent.java
+++ b/dongtai-core/src/main/java/io/dongtai/iast/core/handler/hookpoint/models/MethodEvent.java
@@ -76,7 +76,7 @@ public class MethodEvent {
     /**
      * method all parameters string value
      */
-    public List<Parameter> parameterValues = new ArrayList<Parameter>();
+    public List<Parameter> parameterValues = new ArrayList<>();
 
     /**
      * method return instance
@@ -88,13 +88,13 @@ public class MethodEvent {
      */
     public String returnValue;
 
-    private final Set<Long> sourceHashes = new HashSet<Long>();
+    private final Set<Long> sourceHashes = new HashSet<>();
 
-    private final Set<Long> targetHashes = new HashSet<Long>();
+    private final Set<Long> targetHashes = new HashSet<>();
 
-    public List<MethodEventTargetRange> targetRanges = new ArrayList<MethodEventTargetRange>();
+    public List<MethodEventTargetRange> targetRanges = new ArrayList<>();
 
-    public List<MethodEventTargetRange> sourceRanges = new ArrayList<MethodEventTargetRange>();
+    public List<MethodEventTargetRange> sourceRanges = new ArrayList<>();
 
     public List<MethodEventSourceType> sourceTypes;
 
@@ -232,7 +232,7 @@ public void addParameterValue(int index, Object param, boolean hasTaint) {
         if (param == null) {
             return;
         }
-        String indexString = "P" + String.valueOf(index + 1);
+        String indexString = "P" + (index + 1);
         Parameter parameter = new Parameter(indexString, formatValue(param, hasTaint));
         this.parameterValues.add(parameter);
     }
@@ -247,7 +247,7 @@ public void setReturnValue(Object ret, boolean hasTaint) {
     private String formatValue(Object val, boolean hasTaint) {
         String str = obj2String(val);
         return "[" + StringUtils.normalize(str, MAX_VALUE_LENGTH) + "]"
-                + (hasTaint ? "*" : "") + String.valueOf(str.length());
+                + (hasTaint ? "*" : "") + str.length();
     }
 
     public Set<Long> getSourceHashes() {
diff --git a/dongtai-core/src/main/java/io/dongtai/iast/core/utils/PropertyUtils.java b/dongtai-core/src/main/java/io/dongtai/iast/core/utils/PropertyUtils.java
index 6527a029d..116d2b966 100644
--- a/dongtai-core/src/main/java/io/dongtai/iast/core/utils/PropertyUtils.java
+++ b/dongtai-core/src/main/java/io/dongtai/iast/core/utils/PropertyUtils.java
@@ -23,11 +23,9 @@ public class PropertyUtils {
     private String iastDumpPath;
     private Long heartBeatInterval = -1L;
     private String serverUrl;
-    private String serverMode;
     private String proxyEnableStatus;
     private String proxyHost;
     private int proxyPort = -1;
-    private String debugFlag;
     private Integer responseLength;
     private String policyPath;
     private static List<String> disabledFeatureList;
@@ -183,13 +181,6 @@ public int getProxyPort() {
         return proxyPort;
     }
 
-    private String getDebugFlag() {
-        if (debugFlag == null) {
-            debugFlag = System.getProperty(PropertyConstant.PROPERTY_DEBUG, "false");
-        }
-        return debugFlag;
-    }
-
     public Integer getResponseLength() {
         if (responseLength == null) {
             responseLength = Integer.parseInt(System.getProperty(PropertyConstant.PROPERTY_RESPONSE_LENGTH,