diff --git a/.lycheeignore b/.lycheeignore
index 39c854fd..0b991c43 100644
--- a/.lycheeignore
+++ b/.lycheeignore
@@ -2,3 +2,4 @@ file:///*
 https://querydsl.com/*
 https://uel.java.net/
 https://www.openapis.org/
+https://jcp.org/*
diff --git a/src/main/java/com/qubitpi/ws/jersey/template/cache/LruCache.java b/src/main/java/com/qubitpi/ws/jersey/template/cache/LruCache.java
deleted file mode 100755
index 97f9e712..00000000
--- a/src/main/java/com/qubitpi/ws/jersey/template/cache/LruCache.java
+++ /dev/null
@@ -1,70 +0,0 @@
-/*
- * Copyright Jiaqi Liu
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package com.qubitpi.ws.jersey.template.cache;
-
-import jakarta.validation.constraints.NotNull;
-import net.jcip.annotations.NotThreadSafe;
-
-import java.util.LinkedHashMap;
-import java.util.Map;
-
-/**
- * LRU Cache.
- *
- * @param <K>  The type of keys maintained by this cache
- * @param <V>  The type of cached values
- */
-@NotThreadSafe
-public class LruCache<K, V> extends LinkedHashMap<K, V> {
-
-    private static final long serialVersionUID = -5727315380707628908L;
-
-    private final int cacheSize;
-
-    /**
-     * Constructs an empty {@link LruCache} instance with the provided maximum number of entries hold in the cache.
-     *
-     * @param cacheSize  Maximum number of entries in cache
-     */
-    private LruCache(final int cacheSize) {
-        super(cacheSize * 4 / 3, 0.75f, true);
-        this.cacheSize = cacheSize;
-    }
-
-    /**
-     * Creates a new instance of {@link LruCache} with the provided maximum number of entries hold in the cache.
-     *
-     * @param cacheSize  Maximum number of entries in cache
-     *
-     * @param <K>  The type of keys maintained by this cache
-     * @param <V>  The type of cached values
-     *
-     * @return a new initialized {@link LruCache} instance
-     */
-    @NotNull
-    public static <K, V> LruCache<K, V> ofSize(final int cacheSize) {
-        return new LruCache<>(cacheSize);
-    }
-
-    @Override
-    protected boolean removeEldestEntry(final Map.Entry<K, V> eldest) {
-        return size() > getCacheSize();
-    }
-
-    private int getCacheSize() {
-        return cacheSize;
-    }
-}
diff --git a/src/test/groovy/com/qubitpi/ws/jersey/template/cache/LruCacheSpec.groovy b/src/test/groovy/com/qubitpi/ws/jersey/template/cache/LruCacheSpec.groovy
deleted file mode 100644
index f7d30fe3..00000000
--- a/src/test/groovy/com/qubitpi/ws/jersey/template/cache/LruCacheSpec.groovy
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * Copyright Jiaqi Liu
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package com.qubitpi.ws.jersey.template.cache
-
-import spock.lang.Specification
-
-class LruCacheSpec extends Specification {
-
-    @SuppressWarnings(["GroovyAccessibility"])
-    def "the least frequently used cache entry is removed when cache is full"() {
-        given: "a cache with cache size of 2"
-        LruCache<String, String> cache = new LruCache<>(2)
-
-        when: "inserting 2 entries into cache to make it full"
-        cache.put("foo", "bar")
-        cache.put("bat", "baz")
-
-        then: "all inserted entries are there"
-        cache.toString() == "[foo:bar, bat:baz]"
-
-        when: "outdate an entry and putting a new cache entry into the cache"
-        cache.get("bat")
-        cache.put("new", "new")
-
-        then: "the outdated entry is reomved"
-        cache.toString() == "[bat:baz, new:new]"
-    }
-
-    def "static factory method produces a new instances"() {
-        given: "two instance produced by the same static factory method"
-        LruCache<String, String> first = LruCache.ofSize(3)
-        LruCache<String, String> second = LruCache.ofSize(3)
-
-        expect: "the two instances are different objects"
-        ! first.is(second)
-    }
-}