diff --git a/commons/common-util/src/main/java/com/schbrain/common/util/StreamUtils.java b/commons/common-util/src/main/java/com/schbrain/common/util/StreamUtils.java
index 533f0389ad71bd5b5162ddedda0a0da947f062cb..b80ce58fb43aa0bb8d166d642b089f5c4ba98489 100644
--- a/commons/common-util/src/main/java/com/schbrain/common/util/StreamUtils.java
+++ b/commons/common-util/src/main/java/com/schbrain/common/util/StreamUtils.java
@@ -158,11 +158,15 @@ public class StreamUtils {
     }
 
     public static <T> String join(Iterable<T> data, String delimiter) {
-        return join(data, delimiter, Objects::toString);
+        return join(data, delimiter, Objects::toString, any -> true);
     }
 
-    public static <T> String join(Iterable<T> data, String delimiter, Function<T, String> toStringFunction) {
-        return from(data).map(toStringFunction).collect(joining(delimiter));
+    public static <T> String join(Iterable<T> data, String delimiter, Predicate<String> predicate) {
+        return join(data, delimiter, Objects::toString, predicate);
+    }
+
+    public static <T> String join(Iterable<T> data, String delimiter, Function<T, String> toStringFunction, Predicate<String> predicate) {
+        return from(data).map(toStringFunction).filter(predicate).collect(joining(delimiter));
     }
 
     public static List<String> split(String data) {
diff --git a/commons/web-common/src/main/java/com/schbrain/common/web/exception/DefaultExceptionTranslator.java b/commons/web-common/src/main/java/com/schbrain/common/web/exception/DefaultExceptionTranslator.java
index 932b7a683877ed3f3685d0ba33a443f44449a85e..4eac2de3291359d90f943e724442f79fe2a8b983 100644
--- a/commons/web-common/src/main/java/com/schbrain/common/web/exception/DefaultExceptionTranslator.java
+++ b/commons/web-common/src/main/java/com/schbrain/common/web/exception/DefaultExceptionTranslator.java
@@ -12,11 +12,7 @@ import org.springframework.core.Ordered;
  */
 public class DefaultExceptionTranslator implements ExceptionTranslator<ResponseDTO<String>> {
 
-    private final boolean isProduction;
-
-    public DefaultExceptionTranslator() {
-        this.isProduction = EnvUtils.isProduction();
-    }
+    private final boolean isProduction = EnvUtils.isProduction();
 
     @Override
     public ResponseDTO<String> translate(Throwable throwable, int code, int action, String message) {
diff --git a/commons/web-common/src/main/java/com/schbrain/common/web/support/signature/AbstractSignatureValidationInterceptor.java b/commons/web-common/src/main/java/com/schbrain/common/web/support/signature/AbstractSignatureValidationInterceptor.java
index 216646b27a00b045f3bd819c3b0131d92e92aa25..8605b14e77a0ae4f2e5486f1f0dbce76d9f90ad6 100644
--- a/commons/web-common/src/main/java/com/schbrain/common/web/support/signature/AbstractSignatureValidationInterceptor.java
+++ b/commons/web-common/src/main/java/com/schbrain/common/web/support/signature/AbstractSignatureValidationInterceptor.java
@@ -1,7 +1,7 @@
 package com.schbrain.common.web.support.signature;
 
 import cn.hutool.crypto.digest.DigestUtil;
-import com.google.common.base.Joiner;
+import com.schbrain.common.util.StreamUtils;
 import com.schbrain.common.web.support.BaseHandlerInterceptor;
 import org.apache.commons.lang3.StringUtils;
 import org.springframework.web.method.HandlerMethod;
@@ -9,6 +9,7 @@ import org.springframework.web.util.ContentCachingRequestWrapper;
 
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
+import java.util.List;
 import java.util.Objects;
 
 import static cn.hutool.core.text.StrPool.UNDERLINE;
@@ -17,8 +18,6 @@ import static org.springframework.web.util.WebUtils.getNativeRequest;
 
 public abstract class AbstractSignatureValidationInterceptor<T extends SignatureContext> extends BaseHandlerInterceptor {
 
-    private static final Joiner JOINER = Joiner.on(UNDERLINE).skipNulls();
-
     private static final String SCH_APP_KEY = "Sch-App-Key";
     private static final String SCH_TIMESTAMP = "Sch-Timestamp";
     private static final String SCH_SIGNATURE = "Sch-Signature";
@@ -69,7 +68,7 @@ public abstract class AbstractSignatureValidationInterceptor<T extends Signature
     }
 
     protected String signParams(String requestUri, String queryString, String bodyString, String timestamp, String appKey, String appSecret) {
-        String toSign = JOINER.join(requestUri, queryString, bodyString, timestamp, appKey, appSecret);
+        String toSign = StreamUtils.join(List.of(requestUri, queryString, bodyString, timestamp, appKey, appSecret), UNDERLINE, StringUtils::isNotBlank);
         return DigestUtil.sha256Hex(toSign);
     }