I think this request is not reasonable.
Because `golang` does not support generics only supports empty
interfaces(`interface{}`).
The generics of java are just automatic type conversions by jvm,and the
compile-time type is uniformly erased to `Object`.
Golang either returns the determined type or returns an empty interface.
An empty interface can also be considered a deterministic type
### So
In summary, I think that implementing this function is too expensive.
the caller should know the type of the return value of the service that he is
calling.Even if you don't know, golang also provides a reflection package
(`reflect`) to determine the unknown type.
### java code
``` java
public class JavaClass<V> {
private V verification(V a) {
System.out.println(a.getClass());
return a;
}
private void test() {
JavaClass<Integer> integerJavaTest = new JavaClass<>();
integerJavaTest.verification(1);
}
}
```
### java byte code
```
// class version 52.0 (52)
// access flags 0x21
// signature <V:Ljava/lang/Object;>Ljava/lang/Object;
// declaration: com/boot/security/server/JavaClass<V>
public class com/boot/security/server/JavaClass {
// compiled from: JavaClass.java
// access flags 0x1
public <init>()V
L0
LINENUMBER 7 L0
ALOAD 0
INVOKESPECIAL java/lang/Object.<init> ()V
RETURN
L1
LOCALVARIABLE this Lcom/boot/security/server/JavaClass; L0 L1 0
// signature Lcom/boot/security/server/JavaClass<TV;>;
// declaration: this extends com.boot.security.server.JavaClass<V>
MAXSTACK = 1
MAXLOCALS = 1
// access flags 0x2
// signature (TV;)TV;
// declaration: V verification(V)
private verification(Ljava/lang/Object;)Ljava/lang/Object;
// parameter a
L0
LINENUMBER 11 L0
GETSTATIC java/lang/System.out : Ljava/io/PrintStream;
ALOAD 1
INVOKEVIRTUAL java/lang/Object.getClass ()Ljava/lang/Class;
INVOKEVIRTUAL java/io/PrintStream.println (Ljava/lang/Object;)V
L1
LINENUMBER 12 L1
ALOAD 1
ARETURN
L2
LOCALVARIABLE this Lcom/boot/security/server/JavaClass; L0 L2 0
// signature Lcom/boot/security/server/JavaClass<TV;>;
// declaration: this extends com.boot.security.server.JavaClass<V>
LOCALVARIABLE a Ljava/lang/Object; L0 L2 1
// signature TV;
// declaration: a extends V
MAXSTACK = 2
MAXLOCALS = 2
// access flags 0x2
private test()V
L0
LINENUMBER 17 L0
NEW com/boot/security/server/JavaClass
DUP
INVOKESPECIAL com/boot/security/server/JavaClass.<init> ()V
ASTORE 1
L1
LINENUMBER 18 L1
ALOAD 1
ICONST_1
INVOKESTATIC java/lang/Integer.valueOf (I)Ljava/lang/Integer;
INVOKESPECIAL com/boot/security/server/JavaClass.verification
(Ljava/lang/Object;)Ljava/lang/Object;
POP
L2
LINENUMBER 19 L2
RETURN
L3
LOCALVARIABLE this Lcom/boot/security/server/JavaClass; L0 L3 0
// signature Lcom/boot/security/server/JavaClass<TV;>;
// declaration: this extends com.boot.security.server.JavaClass<V>
LOCALVARIABLE integerJavaTest Lcom/boot/security/server/JavaClass; L1 L3 1
// signature Lcom/boot/security/server/JavaClass<Ljava/lang/Integer;>;
// declaration: integerJavaTest extends
com.boot.security.server.JavaClass<java.lang.Integer>
MAXSTACK = 2
MAXLOCALS = 2
}
```
### You can see that the java type is erased and the method signature is
`Object`.
[ Full content available at: https://github.com/apache/dubbo-go/issues/48 ]
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