fix AfterFilter NullPointer exception in #3443

src/main/java/com/alibaba/fastjson/serializer/AfterFilter.java

@@ -23,9 +23,9 @@ protected final void writeKeyValue(String key, Object value) {
  JSONSerializer serializer = serializerLocal.get();
  char seperator = seperatorLocal.get();
 
- boolean ref = serializer.references.containsKey(value);
+ boolean ref = serializer.containsReference(value);
  serializer.writeKeyValue(seperator, key, value);
- if (!ref) {
+ if (!ref && serializer.references != null) {
  serializer.references.remove(value);
  }
  if (seperator != ',') {

src/test/java/com/alibaba/json/bvt/issue_3300/Issue3443.java

@@ -0,0 +1,58 @@
+package com.alibaba.json.bvt.issue_3300;
+
+import com.alibaba.fastjson.serializer.*;
+import junit.framework.TestCase;
+
+public class Issue3443 extends TestCase {
+ public void testCustomJsonSerializerAndAfterFilter() throws Exception {
+ SerializeWriter serializeWriter = new SerializeWriter();
+ try {
+ JSONSerializer jsonSerializer = new JSONSerializer(serializeWriter, new SerializeConfig());
+
+ Parameter parameter = new Parameter();
+ parameter.setParameterDesc(new ParameterDesc("vipExpireDate", "VIP expire date."));
+
+ jsonSerializer.config(SerializerFeature.DisableCircularReferenceDetect, true);
+ jsonSerializer.getAfterFilters().add(new CustomFilter());
+ jsonSerializer.write(parameter);
+ assertEquals("{\"parameterDesc\":{\"ParameterDesc\":\"VIP expire date.\"}}", serializeWriter.toString());
+ } finally {
+ serializeWriter.close();
+ }
+ }
+
+ static class Parameter {
+ private ParameterDesc parameterDesc;
+
+ public ParameterDesc getParameterDesc() {
+ return parameterDesc;
+ }
+
+ public void setParameterDesc(ParameterDesc parameterType) {
+ this.parameterDesc = parameterType;
+ }
+ }
+
+ static class ParameterDesc {
+ private String parameterName;
+ private String parameterUsage;
+ // do some work...
+
+ public ParameterDesc(String parameterName, String parameterUsage) {
+ this.parameterName = parameterName;
+ this.parameterUsage = parameterUsage;
+ }
+
+
+ }
+
+ static class CustomFilter extends AfterFilter {
+
+ @Override
+ public void writeAfter(Object object) {
+ if (object instanceof ParameterDesc) {
+ writeKeyValue("ParameterDesc", "VIP expire date.");
+ }
+ }
+ }
+}