java - 我可以阻止 Byte Buddy 发出注释的默认值吗？

Question

有什么方法可以阻止 Byte Buddy 为我添加的注释发出默认值吗？使用以下基于构建插件的示例，我希望看到从 @XmlAttribute 的生成字节码中省略了冗余的 required 和 namespace 值baz 字段上的 注释。

foo/Bar.java:

package foo;

import javax.xml.bind.annotation.XmlAttribute;

public class Bar {
    @XmlAttribute(name = "qux")
    public String qux;
}

net/bytebuddy/test/SimplePlugin.java:

...    
public class SimplePlugin implements Plugin {
...    
    @Override
    public DynamicType.Builder<?> apply(DynamicType.Builder<?> builder, TypeDescription typeDescription) {
        return builder.defineField("baz", String.class, Visibility.PUBLIC)
            .annotateField(AnnotationDescription.Builder.ofType(XmlAttribute.class)
                .define("name", "baz")
                .build());
    }
}

foo/Bar.class:

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

package foo;

import javax.xml.bind.annotation.XmlAttribute;

public class Bar {
    @XmlAttribute(
        name = "qux"
    )
    public String qux;
    @XmlAttribute(
        name = "baz",
        required = false,
        namespace = "##default"
    )
    public String baz;

    public Bar() {
    }
}

Answer 1

Byte Buddy 可以配置为跳过默认注释值。但是，配置 Byte Buddy 超出了实现 Plugin 接口(interface)的转换构建插件的范围。 Byte Buddy API 提供了一个单独的 EntryPoint 接口(interface)，可以实现该接口(interface)来控制 Byte Buddy 的初始化。

net/bytebuddy/test/SimpleEntryPoint.java:

package net.bytebuddy.test;

...

public class SimpleEntryPoint implements EntryPoint {
    @Override
    public ByteBuddy getByteBuddy() {
        return new ByteBuddy()
            .with(AnnotationValueFilter.Default.SKIP_DEFAULTS);
    }

    ...
}

pom.xml:

...
    <plugin>
            <groupId>net.bytebuddy</groupId>
            <artifactId>byte-buddy-maven-plugin</artifactId>
            <executions>
                <execution>
                    <goals>
                        <goal>transform</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <initialization>
                    <entryPoint>net.bytebuddy.test.SimpleEntryPoint</entryPoint>
                </initialization>
                <transformations>
                    <transformation>
                        <plugin>net.bytebuddy.test.SimplePlugin</plugin>
                    </transformation>
                </transformations>
            </configuration>
        </plugin>
...

foo/Bar.class:

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

package foo;

import javax.xml.bind.annotation.XmlAttribute;

public class Bar {
    @XmlAttribute(
        name = "qux"
    )
    public String qux;
    @XmlAttribute(
        name = "baz"
    )
    public String baz;

    public Bar() {
    }
}