NPE will occur when consumer lazy init and the consumer thread contextClassLoader is null (#14478)

* hessian2 readObject NPE bugfix

* format the code

---------

Co-authored-by: wiam <[email protected]>

Author: Xwiam

dubbo-serialization/dubbo-serialization-hessian2/src/main/java/org/apache/dubbo/common/serialize/hessian2/Hessian2ObjectInput.java

@@ -23,6 +23,7 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.lang.reflect.Type;
+import java.util.Objects;
 
 import com.alibaba.com.caucho.hessian.io.Hessian2Input;
 
@@ -96,9 +97,9 @@ public String readUTF() throws IOException {
 
     @Override
     public Object readObject() throws IOException {
-        if (!mH2i.getSerializerFactory()
-                .getClassLoader()
-                .equals(Thread.currentThread().getContextClassLoader())) {
+        if (!Objects.equals(
+                mH2i.getSerializerFactory().getClassLoader(),
+                Thread.currentThread().getContextClassLoader())) {
             mH2i.setSerializerFactory(hessian2FactoryManager.getSerializerFactory(
                     Thread.currentThread().getContextClassLoader()));
         }
@@ -108,9 +109,9 @@ public Object readObject() throws IOException {
     @Override
     @SuppressWarnings("unchecked")
     public <T> T readObject(Class<T> cls) throws IOException, ClassNotFoundException {
-        if (!mH2i.getSerializerFactory()
-                .getClassLoader()
-                .equals(Thread.currentThread().getContextClassLoader())) {
+        if (!Objects.equals(
+                mH2i.getSerializerFactory().getClassLoader(),
+                Thread.currentThread().getContextClassLoader())) {
             mH2i.setSerializerFactory(hessian2FactoryManager.getSerializerFactory(
                     Thread.currentThread().getContextClassLoader()));
         }
@@ -119,9 +120,9 @@ public <T> T readObject(Class<T> cls) throws IOException, ClassNotFoundException
 
     @Override
     public <T> T readObject(Class<T> cls, Type type) throws IOException, ClassNotFoundException {
-        if (!mH2i.getSerializerFactory()
-                .getClassLoader()
-                .equals(Thread.currentThread().getContextClassLoader())) {
+        if (!Objects.equals(
+                mH2i.getSerializerFactory().getClassLoader(),
+                Thread.currentThread().getContextClassLoader())) {
             mH2i.setSerializerFactory(hessian2FactoryManager.getSerializerFactory(
                     Thread.currentThread().getContextClassLoader()));
         }