Merge pull request #8125 from eugenp/revert-8119-BAEL-3275-2

Revert "BAEL-3275: Using blocking queue for pub-sub"

jackson-simple/src/test/java/com/baeldung/jackson/serialization/ItemSerializer.java

@@ -0,0 +1,32 @@
+package com.baeldung.jackson.serialization;
+
+import java.io.IOException;
+
+import com.baeldung.jackson.dtos.Item;
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.SerializerProvider;
+import com.fasterxml.jackson.databind.ser.std.StdSerializer;
+
+public class ItemSerializer extends StdSerializer<Item> {
+
+    private static final long serialVersionUID = 6739170890621978901L;
+
+    public ItemSerializer() {
+        this(null);
+    }
+
+    public ItemSerializer(final Class<Item> t) {
+        super(t);
+    }
+
+    @Override
+    public final void serialize(final Item value, final JsonGenerator jgen, final SerializerProvider provider) throws IOException, JsonProcessingException {
+        jgen.writeStartObject();
+        jgen.writeNumberField("id", value.id);
+        jgen.writeStringField("itemName", value.itemName);
+        jgen.writeNumberField("owner", value.owner.id);
+        jgen.writeEndObject();
+    }
+
+}

jackson-simple/src/test/java/com/baeldung/jackson/serialization/ItemSerializerOnClass.java

@@ -0,0 +1,32 @@
+package com.baeldung.jackson.serialization;
+
+import java.io.IOException;
+
+import com.baeldung.jackson.dtos.ItemWithSerializer;
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.SerializerProvider;
+import com.fasterxml.jackson.databind.ser.std.StdSerializer;
+
+public class ItemSerializerOnClass extends StdSerializer<ItemWithSerializer> {
+
+    private static final long serialVersionUID = -1760959597313610409L;
+
+    public ItemSerializerOnClass() {
+        this(null);
+    }
+
+    public ItemSerializerOnClass(final Class<ItemWithSerializer> t) {
+        super(t);
+    }
+
+    @Override
+    public final void serialize(final ItemWithSerializer value, final JsonGenerator jgen, final SerializerProvider provider) throws IOException, JsonProcessingException {
+        jgen.writeStartObject();
+        jgen.writeNumberField("id", value.id);
+        jgen.writeStringField("itemName", value.itemName);
+        jgen.writeNumberField("owner", value.owner.id);
+        jgen.writeEndObject();
+    }
+
+}

jackson-simple/src/test/java/com/baeldung/jackson/serialization/MyDtoNullKeySerializer.java

@@ -0,0 +1,27 @@
+package com.baeldung.jackson.serialization;
+
+import java.io.IOException;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.SerializerProvider;
+import com.fasterxml.jackson.databind.ser.std.StdSerializer;
+
+public class MyDtoNullKeySerializer extends StdSerializer<Object> {
+
+    private static final long serialVersionUID = -4478531309177369056L;
+
+    public MyDtoNullKeySerializer() {
+        this(null);
+    }
+
+    public MyDtoNullKeySerializer(final Class<Object> t) {
+        super(t);
+    }
+
+    @Override
+    public void serialize(final Object value, final JsonGenerator jgen, final SerializerProvider provider) throws IOException, JsonProcessingException {
+        jgen.writeFieldName("");
+    }
+
+}