diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 9171397..a6a1bae 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -14,11 +14,21 @@ on:
         default: false
         type: boolean
         required: false
+      testCoverageDryRun:
+        description: 'dryrun coverage report?'
+        default: false
+        type: boolean
+        required: false
       testVerbose:
         description: 'test output verbose'
         default: false
         type: boolean
         required: false
+      applyQodanaScan:
+        description: 'apply Qodana Scan?'
+        default: true
+        type: boolean
+        required: false
       deployOssrh:
         description: 'deploy to ossrh?'
         default: true
@@ -33,9 +43,13 @@ jobs:
   release:
     name: Release to Sonatype
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+      checks: write
     env:
       MAVEN_OPTS: -Xmx2g
-      TEST_VERBOSE: ${{ inputs.testVerbose }}
+      TEST_VERBOSE: ${{ inputs.testVerbose == 'true' }}
 
     steps:
       - name: Checkout ${{ github.event.release.tag_name }}
@@ -63,31 +77,43 @@ jobs:
       - name: Maven settings.xml
         id: settings
         run: |
+          echo "# env and var" >> "$GITHUB_STEP_SUMMARY"
+          echo "" >> "$GITHUB_STEP_SUMMARY"
           JAVA_HOME=$(asdf where java)
+          echo "- JAVA_HOME=$JAVA_HOME" >> "$GITHUB_STEP_SUMMARY"
           echo "JAVA_HOME=$JAVA_HOME" >> "$GITHUB_OUTPUT"
+          echo "- GIT_BRANCH=$(git branch --show-current)" >> "$GITHUB_STEP_SUMMARY"
           echo "GIT_BRANCH=$(git branch --show-current)" >> "$GITHUB_OUTPUT"
           
           _opt=$(git describe --tags --exact-match 2>/dev/null || true)
           if [ "$_opt" != "" ]; then
             _opt="-Drevision=$_opt"
-            echo "MVN_REVISION=$_opt"
+            echo "- MVN_REVISION=$_opt" >> "$GITHUB_STEP_SUMMARY"
             echo "MVN_REVISION=$_opt" >> "$GITHUB_OUTPUT"
           fi
           
           _ver=$(mvn --quiet --non-recursive -DforceStdout -Dexpression=project.version $_opt help:evaluate)
-          echo "WINGS_VERSION=$_ver"
+          echo "- WINGS_VERSION=$_ver" >> "$GITHUB_STEP_SUMMARY"
           echo "WINGS_VERSION=$_ver" >> "$GITHUB_OUTPUT"
           
           _cov=${{ inputs.testCoverReport || github.event_name == 'push' }}
-          echo "MVN_COVERAGE=$_cov"
+          echo "- MVN_COVERAGE=$_cov" >> "$GITHUB_STEP_SUMMARY"
           echo "MVN_COVERAGE=$_cov" >> "$GITHUB_OUTPUT"
           
           _drh=${{ inputs.deployOssrh || github.event_name == 'release' }}
-          echo "MVN_DEPLOYRH=$_drh"
+          echo "- MVN_DEPLOYRH=$_drh" >> "$GITHUB_STEP_SUMMARY"
           echo "MVN_DEPLOYRH=$_drh" >> "$GITHUB_OUTPUT"
           
-          mvn -v
-          git --no-pager log --graph -10 --pretty=format:'%H - %ai %d %s'
+          _qod=${{ inputs.applyQodanaScan || 'false' }}
+          echo "- QODANA_SCAN=$_qod" >> "$GITHUB_STEP_SUMMARY"
+          echo "QODANA_SCAN=$_qod" >> "$GITHUB_OUTPUT"
+          
+          echo "# mvn and git" >> "$GITHUB_STEP_SUMMARY"
+          echo "" >> "$GITHUB_STEP_SUMMARY"
+          echo '```text' >> "$GITHUB_STEP_SUMMARY"
+          mvn -v >> "$GITHUB_STEP_SUMMARY"
+          git --no-pager log --graph -10 --pretty=format:'%H - %ai %d %s' >> "$GITHUB_STEP_SUMMARY"
+          echo '```' >> "$GITHUB_STEP_SUMMARY"
           
           mkdir -p ~/.m2
           cat > ~/.m2/settings.xml << "EOF"
@@ -102,18 +128,27 @@ jobs:
             </servers>
           </settings>
           EOF
-
+      - name: Qodana Scan
+        uses: JetBrains/qodana-action@v2023.3
+        if: steps.settings.outputs.QODANA_SCAN == 'true'
+        env:
+          QODANA_TOKEN: ${{ secrets.QODANA_TOKEN }}
       ## report if not release
       - name: Test Coverage ${{ steps.settings.outputs.WINGS_VERSION }} ${{ steps.settings.outputs.GIT_BRANCH }}
         if: steps.settings.outputs.MVN_COVERAGE == 'true'
         run: >
           mvn 
-          -P coverage
-          -Dmaven.test.failure.ignore=${{ inputs.testFailureIgnore }}
-          -DrepoToken=${{ secrets.COVERALLS_REPO_TOKEN }}
+          -P 'coverage'
+          -Dmaven.test.failure.ignore=$TESTFAILS_IGNORE
+          -DrepoToken=$COVERALLS_WINGS -DdryRun=$COVERALLS_DRYRUN
           clean test jacoco:report coveralls:report
         env:
+          TZ: Asia/Shanghai
           JAVA_HOME: ${{ steps.settings.outputs.JAVA_HOME }}
+          COVERALLS_WINGS: ${{ secrets.COVERALLS_REPO_TOKEN }}
+          COVERALLS_DRYRUN: ${{ inputs.testCoverageDryRun || 'false' }}
+          TESTFAILS_IGNORE: ${{ inputs.testFailureIgnore || 'false' }}
+
       ## import gpp private key
       - name: Import GPG key
         if: steps.settings.outputs.MVN_DEPLOYRH == 'true'
@@ -127,7 +162,7 @@ jobs:
         if: steps.settings.outputs.MVN_DEPLOYRH == 'true'
         run: >
           mvn 
-          -P ossrh
+          -P 'ossrh'
           ${{ steps.settings.outputs.MVN_REVISION }}
           -Dgpg.passphrase=${MVN_GPG_PASS}
           clean deploy
diff --git a/src/main/java/pro/fessional/mirana/best/DummyBlock.java b/src/main/java/pro/fessional/mirana/best/DummyBlock.java
index 436619c..256985f 100644
--- a/src/main/java/pro/fessional/mirana/best/DummyBlock.java
+++ b/src/main/java/pro/fessional/mirana/best/DummyBlock.java
@@ -28,7 +28,9 @@ public static void ignore(Throwable t) {
     /**
      * statement has empty body
      */
+    @SuppressWarnings("EmptyMethod")
     public static void empty() {
+        // ignore, need empty
     }
 
     /**
diff --git a/src/main/java/pro/fessional/mirana/best/TypedKey.java b/src/main/java/pro/fessional/mirana/best/TypedKey.java
index ceeb125..bca8df9 100644
--- a/src/main/java/pro/fessional/mirana/best/TypedKey.java
+++ b/src/main/java/pro/fessional/mirana/best/TypedKey.java
@@ -67,6 +67,7 @@ public boolean equals(Object o) {
         if (this == o) return true;
         if (!(o instanceof TypedReg)) return false;
         TypedReg<?, ?> reg = (TypedReg<?, ?>) o;
+        //noinspection EqualsBetweenInconvertibleTypes
         return Objects.equals(regType, reg.regType);
     }
 
diff --git a/src/main/java/pro/fessional/mirana/bits/Bytes.java b/src/main/java/pro/fessional/mirana/bits/Bytes.java
index 4686cf6..4d697da 100644
--- a/src/main/java/pro/fessional/mirana/bits/Bytes.java
+++ b/src/main/java/pro/fessional/mirana/bits/Bytes.java
@@ -123,6 +123,7 @@ public static int unicode(char c, byte[] ob) {
         if (ob == null) return 0;
 
         if (c > Byte.MAX_VALUE) {
+            //noinspection UnnecessaryLocalVariable
             final int i = c;
             ob[0] = '\\';
             ob[1] = 'u';
diff --git a/src/main/java/pro/fessional/mirana/code/SlotCode.java b/src/main/java/pro/fessional/mirana/code/SlotCode.java
index 27e8cc2..9a13039 100644
--- a/src/main/java/pro/fessional/mirana/code/SlotCode.java
+++ b/src/main/java/pro/fessional/mirana/code/SlotCode.java
@@ -28,7 +28,6 @@ public class SlotCode {
     }
 
     public final int size;
-    private final int last;
     private final Slot[] slot;
     private final Random rand;
 
@@ -49,7 +48,7 @@ public SlotCode(int size, Supplier<Random> rand) {
     public SlotCode(int size, Random rand) {
         final int page = (size - 1) / bits + 1;
         this.size = size;
-        this.last = (1 << (bits - size % bits)) - 1;
+        int last = (1 << (bits - size % bits)) - 1;
         this.rand = rand;
         this.slot = new Slot[page];
         for (int i = 0; i < page; i++) {
diff --git a/src/main/java/pro/fessional/mirana/cond/EqualsUtil.java b/src/main/java/pro/fessional/mirana/cond/EqualsUtil.java
index dfed1dc..f47e019 100644
--- a/src/main/java/pro/fessional/mirana/cond/EqualsUtil.java
+++ b/src/main/java/pro/fessional/mirana/cond/EqualsUtil.java
@@ -68,7 +68,7 @@ public static boolean inVal(Number a, Number[] nums) {
     public static boolean inVal(Number a, Number b, Number... nums) {
         if (a == null || b == null || nums == null) return false;
         final boolean e = eqVal(a, b);
-        return e ? e : inVal(a, Arrays.asList(nums));
+        return e || inVal(a, Arrays.asList(nums));
 
     }
 
@@ -133,7 +133,7 @@ public static boolean inCase(String a, CharSequence[] strs) {
     public static boolean inCase(String a, CharSequence b, CharSequence... strs) {
         if (a == null || b == null || strs == null) return false;
         final boolean e = eqCase(a, b);
-        return e ? e : inCase(a, Arrays.asList(strs));
+        return e || inCase(a, Arrays.asList(strs));
     }
 
     public static boolean inCase(String a, Iterable<? extends CharSequence> strs) {
@@ -159,7 +159,7 @@ public static boolean inCaseless(String a, CharSequence[] strs) {
     public static boolean inCaseless(String a, CharSequence b, CharSequence... strs) {
         if (a == null || b == null || strs == null) return false;
         final boolean e = eqCaseless(a, b);
-        return e ? e : inCaseless(a, Arrays.asList(strs));
+        return e || inCaseless(a, Arrays.asList(strs));
     }
 
     public static boolean inCaseless(String a, Iterable<? extends CharSequence> strs) {
diff --git a/src/main/java/pro/fessional/mirana/data/Arr.java b/src/main/java/pro/fessional/mirana/data/Arr.java
index 9369ae6..1f6ba5a 100644
--- a/src/main/java/pro/fessional/mirana/data/Arr.java
+++ b/src/main/java/pro/fessional/mirana/data/Arr.java
@@ -69,7 +69,7 @@ public static byte[] set(byte[] arr, int idx, byte v) {
             return arr;
         }
         else {
-            byte[] tmp = new byte[Math.max(idx, arr.length) + 1];
+            byte[] tmp = new byte[idx + 1];
             System.arraycopy(arr, 0, tmp, 0, arr.length);
             tmp[idx] = v;
             return tmp;
@@ -83,7 +83,7 @@ public static short[] set(short[] arr, int idx, short v) {
             return arr;
         }
         else {
-            short[] tmp = new short[Math.max(idx, arr.length) + 1];
+            short[] tmp = new short[idx + 1];
             System.arraycopy(arr, 0, tmp, 0, arr.length);
             tmp[idx] = v;
             return tmp;
@@ -97,7 +97,7 @@ public static char[] set(char[] arr, int idx, char v) {
             return arr;
         }
         else {
-            char[] tmp = new char[Math.max(idx, arr.length) + 1];
+            char[] tmp = new char[idx + 1];
             System.arraycopy(arr, 0, tmp, 0, arr.length);
             tmp[idx] = v;
             return tmp;
@@ -111,7 +111,7 @@ public static int[] set(int[] arr, int idx, int v) {
             return arr;
         }
         else {
-            int[] tmp = new int[Math.max(idx, arr.length) + 1];
+            int[] tmp = new int[idx + 1];
             System.arraycopy(arr, 0, tmp, 0, arr.length);
             tmp[idx] = v;
             return tmp;
@@ -125,7 +125,7 @@ public static long[] set(long[] arr, int idx, long v) {
             return arr;
         }
         else {
-            long[] tmp = new long[Math.max(idx, arr.length) + 1];
+            long[] tmp = new long[idx + 1];
             System.arraycopy(arr, 0, tmp, 0, arr.length);
             tmp[idx] = v;
             return tmp;
@@ -139,7 +139,7 @@ public static float[] set(float[] arr, int idx, float v) {
             return arr;
         }
         else {
-            float[] tmp = new float[Math.max(idx, arr.length) + 1];
+            float[] tmp = new float[idx + 1];
             System.arraycopy(arr, 0, tmp, 0, arr.length);
             tmp[idx] = v;
             return tmp;
@@ -153,7 +153,7 @@ public static double[] set(double[] arr, int idx, double v) {
             return arr;
         }
         else {
-            double[] tmp = new double[Math.max(idx, arr.length) + 1];
+            double[] tmp = new double[idx + 1];
             System.arraycopy(arr, 0, tmp, 0, arr.length);
             tmp[idx] = v;
             return tmp;
diff --git a/src/main/java/pro/fessional/mirana/data/DataResult.java b/src/main/java/pro/fessional/mirana/data/DataResult.java
index 47d968e..894da3b 100644
--- a/src/main/java/pro/fessional/mirana/data/DataResult.java
+++ b/src/main/java/pro/fessional/mirana/data/DataResult.java
@@ -41,7 +41,7 @@ default boolean isSuccess() {
      */
     default boolean hasMessage() {
         String msg = getMessage();
-        return msg != null && msg.length() > 0;
+        return msg != null && !msg.isEmpty();
     }
 
     /**
diff --git a/src/main/java/pro/fessional/mirana/data/Z.java b/src/main/java/pro/fessional/mirana/data/Z.java
index 4044441..bed8dda 100644
--- a/src/main/java/pro/fessional/mirana/data/Z.java
+++ b/src/main/java/pro/fessional/mirana/data/Z.java
@@ -139,7 +139,7 @@ static BigDecimal decimalSafe(BigDecimal d, Iterable<? extends CharSequence> ts)
         for (CharSequence t : ts) {
             if (t != null && t.length() > 0) {
                 String s = t.toString().trim();
-                if (s.length() > 0) {
+                if (!s.isEmpty()) {
                     try {
                         return new BigDecimal(s);
                     }
@@ -177,7 +177,7 @@ static Long int64Safe(Long d, Iterable<? extends CharSequence> ts) {
         for (CharSequence t : ts) {
             if (t != null && t.length() > 0) {
                 String s = t.toString().trim();
-                if (s.length() > 0) {
+                if (!s.isEmpty()) {
                     try {
                         return Long.valueOf(s);
                     }
@@ -215,7 +215,7 @@ static Integer int32Safe(Integer d, Iterable<? extends CharSequence> ts) {
         for (CharSequence t : ts) {
             if (t != null && t.length() > 0) {
                 String s = t.toString().trim();
-                if (s.length() > 0) {
+                if (!s.isEmpty()) {
                     try {
                         return Integer.valueOf(s);
                     }
@@ -330,7 +330,7 @@ static String notBlankSafe(String d, Iterable<? extends CharSequence> ts) {
         for (CharSequence t : ts) {
             if (t != null && t.length() > 0) {
                 String s = t.toString().trim();
-                if (s.length() > 0) return s;
+                if (!s.isEmpty()) return s;
             }
         }
         return d;
diff --git a/src/main/java/pro/fessional/mirana/func/Clz.java b/src/main/java/pro/fessional/mirana/func/Clz.java
index 8b8c5ba..73fb443 100644
--- a/src/main/java/pro/fessional/mirana/func/Clz.java
+++ b/src/main/java/pro/fessional/mirana/func/Clz.java
@@ -35,13 +35,12 @@ else if (c == '[') { // Array
                         if (p < 0) throw new RuntimeException("Invalid signature: " + signature);
                         list.add(Class.forName(signature.substring(i, p + 1).replace('/', '.')));
                         i = p;
-                        break;
                     }
                     else {
                         list.add(Class.forName(signature.substring(i, Math.min(j + 1, len))));
                         i = j;
-                        break;
                     }
+                    break;
                 }
             }
             else if (c == 'B') list.add(byte.class);
diff --git a/src/main/java/pro/fessional/mirana/i18n/I18nString.java b/src/main/java/pro/fessional/mirana/i18n/I18nString.java
index 9416d1c..8f35d7b 100644
--- a/src/main/java/pro/fessional/mirana/i18n/I18nString.java
+++ b/src/main/java/pro/fessional/mirana/i18n/I18nString.java
@@ -67,7 +67,7 @@ public String getI18n() {
 
     @Contract("_ -> this")
     public I18nString setHint(String hint) {
-        this.hint = hint == null ? "" : hint;;
+        this.hint = hint == null ? "" : hint;
         return this;
     }
 
@@ -114,8 +114,8 @@ public String getI18nHint() {
 
     @Override
     public String toString() {
-        if (i18n != null && i18n.length() > 0) return i18n;
-        if (hint != null && hint.length() > 0) return hint;
+        if (i18n != null && !i18n.isEmpty()) return i18n;
+        if (hint != null && !hint.isEmpty()) return hint;
         return code;
     }
 
diff --git a/src/main/java/pro/fessional/mirana/id/LightIdBufferedProvider.java b/src/main/java/pro/fessional/mirana/id/LightIdBufferedProvider.java
index 578abd4..a6ccfcf 100644
--- a/src/main/java/pro/fessional/mirana/id/LightIdBufferedProvider.java
+++ b/src/main/java/pro/fessional/mirana/id/LightIdBufferedProvider.java
@@ -200,13 +200,15 @@ public boolean setMinCount(int n) {
 
     /**
      * Whether to preload a fixed count of ids.
-     * fixed if greater than zero, dynamic otherwise
+     * fixed if ge FIX_COUNT, dynamic otherwise
      *
-     * @param n count, Fixed count if greater than 0
+     * @param n count, Fixed count if ge FIX_COUNT
      * @return success or not
      * @see #FIX_COUNT
      */
     public boolean setFixCount(int n) {
+        if (n < FIX_COUNT) return false;
+
         loadFixCount = n;
         return true;
     }
diff --git a/src/main/java/pro/fessional/mirana/page/PageResult.java b/src/main/java/pro/fessional/mirana/page/PageResult.java
index ae4e8f9..627aac5 100644
--- a/src/main/java/pro/fessional/mirana/page/PageResult.java
+++ b/src/main/java/pro/fessional/mirana/page/PageResult.java
@@ -237,7 +237,7 @@ public PageResult<E> addData(E e) {
 
     @Contract("_->this")
     public PageResult<E> addData(Collection<E> ds) {
-        if (ds != null && ds.size() > 0) {
+        if (ds != null && !ds.isEmpty()) {
             Collection<E> data = getData();
             if (data == empty) {
                 data = new ArrayList<>(size > 0 ? size : 20);
@@ -250,7 +250,7 @@ public PageResult<E> addData(Collection<E> ds) {
     @Override
     public boolean hasData() {
         final Collection<E> data = getData();
-        return data.size() > 0;
+        return !data.isEmpty();
     }
 
     @NotNull
diff --git a/src/main/java/pro/fessional/mirana/page/PageUtil.java b/src/main/java/pro/fessional/mirana/page/PageUtil.java
index 1ce6f14..ac2be43 100644
--- a/src/main/java/pro/fessional/mirana/page/PageUtil.java
+++ b/src/main/java/pro/fessional/mirana/page/PageUtil.java
@@ -99,7 +99,7 @@ public Sb(StringBuilder sb) {
 
         @Contract("_,_->this")
         public Sb by(String key, boolean asc) {
-            if (key != null && key.length() > 0) {
+            if (key != null && !key.isEmpty()) {
                 buf.append(SORT_DELI);
                 if (!asc) buf.append(SORT_DESC);
                 buf.append(key);
diff --git a/src/main/java/pro/fessional/mirana/pain/ThrowableUtil.java b/src/main/java/pro/fessional/mirana/pain/ThrowableUtil.java
index 523fd37..f1d7ae3 100644
--- a/src/main/java/pro/fessional/mirana/pain/ThrowableUtil.java
+++ b/src/main/java/pro/fessional/mirana/pain/ThrowableUtil.java
@@ -54,12 +54,12 @@ private static void print(@Out final Appendable buffer, final Throwable t, final
         boolean caused = c != null;
         try {
             if (reverse) {
-                if (caused) print(buffer, c, reverse, shorten, stack, max, nextDepth);
-                doPrint(buffer, t, reverse, shorten, !caused, caused ? stack : Integer.MAX_VALUE, cur);
+                if (caused) print(buffer, c, true, shorten, stack, max, nextDepth);
+                doPrint(buffer, t, true, shorten, !caused, caused ? stack : Integer.MAX_VALUE, cur);
             }
             else {
-                doPrint(buffer, t, reverse, shorten, !caused, caused ? stack : Integer.MAX_VALUE, cur);
-                if (caused) print(buffer, c, reverse, shorten, stack, max, nextDepth);
+                doPrint(buffer, t, false, shorten, !caused, caused ? stack : Integer.MAX_VALUE, cur);
+                if (caused) print(buffer, c, false, shorten, stack, max, nextDepth);
             }
         }
         catch (IOException e) {
@@ -164,7 +164,7 @@ public static Throwable root(Throwable t) {
                 t = x;
             }
         }
-        return t;
+        return null;
     }
 
     /**
diff --git a/src/main/java/pro/fessional/mirana/stat/GitStat.java b/src/main/java/pro/fessional/mirana/stat/GitStat.java
index 0913100..b558704 100644
--- a/src/main/java/pro/fessional/mirana/stat/GitStat.java
+++ b/src/main/java/pro/fessional/mirana/stat/GitStat.java
@@ -197,7 +197,7 @@ public static String trimFile(String... str) {
         StringBuilder out = new StringBuilder();
         ByteArrayOutputStream buf = new ByteArrayOutputStream();
         for (String s : str) {
-            if (s == null || s.length() == 0) continue;
+            if (s == null || s.isEmpty()) continue;
 
             for (int i = 0, len = s.length(); i < len; i++) {
                 char c = s.charAt(i);
diff --git a/src/main/java/pro/fessional/mirana/text/BuilderHelper.java b/src/main/java/pro/fessional/mirana/text/BuilderHelper.java
index 6f5aa6c..1cfc565 100644
--- a/src/main/java/pro/fessional/mirana/text/BuilderHelper.java
+++ b/src/main/java/pro/fessional/mirana/text/BuilderHelper.java
@@ -334,11 +334,13 @@ public W append(char c) {
         }
 
         @Override
+        @NotNull
         public IntStream chars() {
             return builder.chars();
         }
 
         @Override
+        @NotNull
         public IntStream codePoints() {
             return builder.codePoints();
         }
@@ -354,6 +356,7 @@ public char charAt(int index) {
         }
 
         @Override
+        @NotNull
         public CharSequence subSequence(int start, int end) {
             return builder.subSequence(start, end);
         }
diff --git a/src/main/java/pro/fessional/mirana/text/HalfCharUtil.java b/src/main/java/pro/fessional/mirana/text/HalfCharUtil.java
index 978d664..5abbd8b 100644
--- a/src/main/java/pro/fessional/mirana/text/HalfCharUtil.java
+++ b/src/main/java/pro/fessional/mirana/text/HalfCharUtil.java
@@ -19,7 +19,8 @@ public static String half(CharSequence cs) {
             if (c == '\u3000') {
                 c = ' ';
             }
-            else if (c > '\uFF00' && c < '\uFF5F') {
+            else //noinspection UnnecessaryUnicodeEscape
+                if (c > '\uFF00' && c < '\uFF5F') {
                 c = (char) (c - 65248);
             }
             sb.append(c);
@@ -31,7 +32,8 @@ public static char half(char c) {
         if (c == '\u3000') {
             c = ' ';
         }
-        else if (c > '\uFF00' && c < '\uFF5F') {
+        else //noinspection UnnecessaryUnicodeEscape
+            if (c > '\uFF00' && c < '\uFF5F') {
             c = (char) (c - 65248);
         }
         return c;
diff --git a/src/main/java/pro/fessional/mirana/text/StringTemplate.java b/src/main/java/pro/fessional/mirana/text/StringTemplate.java
index 3b236e5..164135d 100644
--- a/src/main/java/pro/fessional/mirana/text/StringTemplate.java
+++ b/src/main/java/pro/fessional/mirana/text/StringTemplate.java
@@ -79,7 +79,7 @@ private B(boolean fix, String txt) {
         @NotNull
         @Contract("_,_->this")
         public B bindStr(String str, Object obj) {
-            if (str != null && str.length() > 0) {
+            if (str != null && !str.isEmpty()) {
                 final K k = new K(false, str, keys.size());
                 keys.add(k);
                 objs.add(obj);
@@ -90,7 +90,7 @@ public B bindStr(String str, Object obj) {
         @NotNull
         @Contract("_,_->this")
         public B bindReg(String reg, Object obj) {
-            if (reg != null && reg.length() > 0) {
+            if (reg != null && !reg.isEmpty()) {
                 final K k = new K(true, reg, keys.size());
                 keys.add(k);
                 objs.add(obj);
diff --git a/src/main/java/pro/fessional/mirana/time/DateParser.java b/src/main/java/pro/fessional/mirana/time/DateParser.java
index 0ee6719..354f4c1 100644
--- a/src/main/java/pro/fessional/mirana/time/DateParser.java
+++ b/src/main/java/pro/fessional/mirana/time/DateParser.java
@@ -715,7 +715,7 @@ public int getErrorIndex() {
 
     // /////////////////////////////
 
-    enum Ptn {
+    public enum Ptn {
         DATE(8, new String[]{"2000", "01", "01"}),
         TIME(9, new String[]{"00", "00", "00", "000"}),
         FULL(17, new String[]{"2000", "01", "01", "00", "00", "00", "000"}),
diff --git a/src/main/java/pro/fessional/mirana/time/Sleep.java b/src/main/java/pro/fessional/mirana/time/Sleep.java
index b861b53..6bbbf12 100644
--- a/src/main/java/pro/fessional/mirana/time/Sleep.java
+++ b/src/main/java/pro/fessional/mirana/time/Sleep.java
@@ -59,6 +59,7 @@ public static void snoozeInterrupt(long ms) {
         boolean rup = false;
         do {
             try {
+                //noinspection BusyWait
                 Thread.sleep(ms);
                 break;
             }
diff --git a/src/main/java/pro/fessional/mirana/time/ThreadNow.java b/src/main/java/pro/fessional/mirana/time/ThreadNow.java
index 74bae15..da60bb5 100644
--- a/src/main/java/pro/fessional/mirana/time/ThreadNow.java
+++ b/src/main/java/pro/fessional/mirana/time/ThreadNow.java
@@ -61,6 +61,7 @@ public static ZoneId sysZoneId() {
      *
      * @see #UtcTimeZone
      */
+    @SuppressWarnings("SameReturnValue")
     public static TimeZone utcTimeZone() {
         return UtcTimeZone;
     }
@@ -70,6 +71,7 @@ public static TimeZone utcTimeZone() {
      *
      * @see #UtcZoneId
      */
+    @SuppressWarnings("SameReturnValue")
     public static ZoneId utcZoneId() {
         return UtcZoneId;
     }