Ensure when equals() is implemented so is hashCode()

Update classes that override `equals()` to ensure that they also
implement `hashCode()`.

Issue: SPR-16968

spring-aop/src/main/java/org/springframework/aop/support/MethodMatchers.java

@@ -192,6 +192,14 @@ public abstract class MethodMatchers {
 			return (targetClass != null && this.cf2.matches(targetClass));
 		}
 
+		@Override
+		public int hashCode() {
+			int hashCode = 17;
+			hashCode = 37 * hashCode + this.cf1.hashCode();
+			hashCode = 37 * hashCode + this.cf2.hashCode();
+			return hashCode;
+		}
+
 		@Override
 		public boolean equals(Object other) {
 			if (this == other) {

spring-beans/src/main/java/org/springframework/beans/factory/config/DependencyDescriptor.java

@@ -39,6 +39,7 @@ import org.springframework.core.MethodParameter;
 import org.springframework.core.ParameterNameDiscoverer;
 import org.springframework.core.ResolvableType;
 import org.springframework.lang.Nullable;
+import org.springframework.util.ObjectUtils;
 
 /**
  * Descriptor for a specific dependency that is about to be injected.
@@ -374,7 +375,6 @@ public class DependencyDescriptor extends InjectionPoint implements Serializable
 		}
 	}
 
-
 	@Override
 	public boolean equals(Object other) {
 		if (this == other) {
@@ -388,6 +388,16 @@ public class DependencyDescriptor extends InjectionPoint implements Serializable
 				this.nestingLevel == otherDesc.nestingLevel && this.containingClass == otherDesc.containingClass);
 	}
 
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = ObjectUtils.nullSafeHashCode(this.containingClass);
+		result = prime * result + Boolean.hashCode(this.eager);
+		result = prime * result + this.nestingLevel;
+		result = prime * result + Boolean.hashCode(this.required);
+		return result;
+	}
+
 
 	//---------------------------------------------------------------------
 	// Serialization support

spring-jms/src/main/java/org/springframework/jms/connection/CachingConnectionFactory.java

@@ -580,6 +580,16 @@ public class CachingConnectionFactory extends SingleConnectionFactory {
 					this.durable == otherKey.durable);
 		}
 
+		@Override
+		public int hashCode() {
+			int prime = 31;
+			int result = ObjectUtils.nullSafeHashCode(this.selector);
+			result = prime * result + ObjectUtils.nullSafeHashCode(this.noLocal);
+			result = prime * result + ObjectUtils.nullSafeHashCode(this.subscription);
+			result = prime * result + Boolean.hashCode(this.durable);
+			return result;
+		}
+
 		@Override
 		public String toString() {
 			return super.toString() + " [selector=" + this.selector + ", noLocal=" + this.noLocal +