Introduce Checkstyle rule for separator symbol location

spring-context-support/src/main/java/org/springframework/cache/jcache/interceptor/AbstractJCacheKeyOperation.java

@@ -79,8 +79,8 @@ abstract class AbstractJCacheKeyOperation<A extends Annotation> extends Abstract
 		for (CacheParameterDetail keyParameterDetail : this.keyParameterDetails) {
 			int parameterPosition = keyParameterDetail.getParameterPosition();
 			if (parameterPosition >= values.length) {
-				throw new IllegalStateException("Values mismatch, key parameter at position "
-						+ parameterPosition + " cannot be matched against " + values.length + " value(s)");
+				throw new IllegalStateException("Values mismatch, key parameter at position " +
+						parameterPosition + " cannot be matched against " + values.length + " value(s)");
 			}
 			result.add(keyParameterDetail.toCacheInvocationParameter(values[parameterPosition]));
 		}

spring-context-support/src/test/java/org/springframework/cache/jcache/interceptor/JCacheKeyGeneratorTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,7 +17,6 @@
 package org.springframework.cache.jcache.interceptor;
 
 import java.lang.reflect.Method;
-import java.util.Arrays;
 import java.util.concurrent.atomic.AtomicLong;
 
 import javax.cache.annotation.CacheDefaults;
@@ -150,9 +149,9 @@ class JCacheKeyGeneratorTests {
 
 		@Override
 		public Object generate(Object target, Method method, Object... params) {
-			assertThat(Arrays.equals(expectedParams, params)).as("Unexpected parameters: expected: "
-					+ Arrays.toString(this.expectedParams) + " but got: " + Arrays.toString(params)).isTrue();
+			assertThat(params).as("Unexpected parameters").isEqualTo(expectedParams);
 			return new SimpleKey(params);
 		}
 	}
+
 }