Eclipse内容不支持Groovy文件中的Java对象

Question

I found this question Eclipse Groovy and autocompletion and am experiencing the same issue, however, it is almost three years hence and I am using the current version of the Groovy Eclipse plugin, and there do not appear to be any syntax errors that would be confusing ANTLR .

I also tried using the Groovy/Grails Tool Suite , and got the same results.

I have mocked up a simple test case under which the content assist works for Groovy objects' methods, and for Java objects' static members, but not Java objects' methods.

The Groovy class:

package test_groovy

import test_groovy.FooJava

class FooGroovy
{
    def fooJava = [2, "baz"] as FooJava

    def x = 4

    def FooGroovy()
    {
        // empty constructor    
    }

    def useFooJava()
    {
        // only displays Groovy methods, not the java ones
        def str = fooJava.getStr()
        println "str: ${str}"

        // static members like this *can* be found via content assist
        def str2 = FooJava.FOO_STR
        println "str2: ${str2}"

        // This is also not found via content assist
        def str3 = fooJava.dumpToStr()
        println "str3: ${str3}"
    }

    def fooBar()
    {
        return x + 3
    }

    static void main(def args)
    {
        def fooGroovy = [] as FooGroovy

        // Groovy object methods can be found via content assist
        def res = fooGroovy.fooBar()
        println "res: ${res}"

        fooGroovy.useFooJava()
    }
}

The Java class:

package test_groovy;

public class FooJava
{
    private long bar;
    private String str;

    public static final String FOO_STR = "foo";

    public FooJava(long bar, String str)
    {
        super();
        this.bar = bar;
        this.str = str;
    }

    public long getBar()
    {
        return bar;
    }

    public void setBar(long bar)
    {
        this.bar = bar;
    }

    public String getStr()
    {
        return str;
    }

    public void setStr(String str)
    {
        this.str = str;
    }

    public String dumpToStr()
    {
        return new String("Str: " + str + ", bar: " + bar);
    }

}

I am using Eclipse Kepler Service Release 2, Groovy compiler 2.0.7 and Groovy Eclipse plugin version 2.8.0.xx-20130703-1600-e43-RELEASE.

Under the Java > Editor > Content Assist > Advanced preferences menu, I have made sure all the Java options are checked off in addition to Groovy Content (Java Non-Type, Java, Java type Proposals).

Since this does seem to work in general for some, I am wondering what I could be missing here that would allow content assist to work for Java object methods. Thanks.

Answer 1

I was continuing to think about this, and had a thought which I just tested out which allows content-assist to work, albeit under less- Groovy conditions:

It appears that the root of the problem is that Groovy Eclipse can't do auto-complete on Java objects if they are declared in a Groovy way using def , ie:

def fooJava = [2, "baz"] as FooJava
def fooJava2 = new FooJava(3, "bar")

even though in both of these cases, the type is known at compile time. I suspect it has something to do with the fact that def is essentially an alias for Object , and even though the type is technically known, it is probably treated as Object , and so that's the type on which the content-assist operates.

If I declare it in the traditional Java way, ie:

FooJava fooJava3 = new FooJava(4, "foo")

Content assist then allows me to find the members, methods, etc. of the FooJava object.

So, I can certainly do this in the future to work around the issue, but I do wonder if there is any way to essentially have my cake and eat it too.

ie Has anyone found a way to get content assist to work on Java objects declared via the def syntax, so long as the type is known?