代码在Eclipse中编译,但不是通过命令提示符编译

Question

以下代码使用JDK7在Eclipse中编译没有任何问题(我使用的是更新10,但应该可以与任何版本的JDK7一起使用),但是在通过命令行使用完全相同的JDK进行编译时会失败.该类只提供接口方法的存根实现.

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.security.cert.X509Certificate;
import java.util.Dictionary;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;

import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleException;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.Version;


public class TestBundle implements Bundle {

    /**
     * @param args
     */
    public static void main(String[] args) {


    }

    @Override
    public int compareTo(Bundle o) {

        return 0;
    }

    @Override
    public <A> A adapt(Class<A> arg0) {

        return null;
    }

    @Override
    public Enumeration<URL> findEntries(String arg0, String arg1, boolean arg2) {

        return null;
    }

    @Override
    public BundleContext getBundleContext() {

        return null;
    }

    @Override
    public long getBundleId() {

        return 0;
    }

    @Override
    public File getDataFile(String arg0) {

        return null;
    }

    @Override
    public URL getEntry(String arg0) {

        return null;
    }

    @Override
    public Enumeration<String> getEntryPaths(String arg0) {

        return null;
    }

    @Override
    public Dictionary<String, String> getHeaders() {

        return null;
    }

    @Override
    public Dictionary<String, String> getHeaders(String arg0) {

        return null;
    }

    @Override
    public long getLastModified() {

        return 0;
    }

    @Override
    public String getLocation() {

        return null;
    }

    @Override
    public ServiceReference<?>[] getRegisteredServices() {

        return null;
    }

    @Override
    public URL getResource(String arg0) {

        return null;
    }

    @Override
    public Enumeration<URL> getResources(String arg0) throws IOException {

        return null;
    }

    @Override
    public ServiceReference<?>[] getServicesInUse() {

        return null;
    }

    @Override
    public Map<X509Certificate, List<X509Certificate>> getSignerCertificates(
            int arg0) {

        return null;
    }

    @Override
    public int getState() {

        return 0;
    }

    @Override
    public String getSymbolicName() {

        return null;
    }

    @Override
    public Version getVersion() {

        return null;
    }

    @Override
    public boolean hasPermission(Object arg0) {

        return false;
    }

    @Override
    public Class<?> loadClass(String arg0) throws ClassNotFoundException {

        return null;
    }

    @Override
    public void start() throws BundleException {


    }

    @Override
    public void start(int arg0) throws BundleException {


    }

    @Override
    public void stop() throws BundleException {


    }

    @Override
    public void stop(int arg0) throws BundleException {


    }

    @Override
    public void uninstall() throws BundleException {


    }

    @Override
    public void update() throws BundleException {


    }

    @Override
    public void update(InputStream arg0) throws BundleException {


    }

}

osgi的jar文件可以从这里下载

我使用以下命令通过命令行编译它:

javac.exe -cp org.eclipse.osgi_3.8.0.v20120529-1548.jar TestBundle.java

通过命令行编译时出现以下错误:

TestBundle.java:101: error: type ServiceReference does not take parameters
        public ServiceReference<?>[] getRegisteredServices() {
                               ^
TestBundle.java:119: error: type ServiceReference does not take parameters
        public ServiceReference<?>[] getServicesInUse() {
                               ^
TestBundle.java:18: error: TestBundle is not abstract and does not override abstract method adapt(Class) in Bundle
public class TestBundle implements Bundle {
       ^
TestBundle.java:28: error: method does not override or implement a method from a supertype
        @Override
        ^
TestBundle.java:35: error: name clash: <A>adapt(Class<A>) in TestBundle and adapt(Class) in Bundle have the same erasure, yet neither overrides the other
        public <A> A adapt(Class<A> arg0) {
                     ^
  where A is a type-variable:
    A extends Object declared in method <A>adapt(Class<A>)
TestBundle.java:34: error: method does not override or implement a method from a supertype
        @Override
        ^
6 errors

Answer 1

在Java 7上编译时,OSGi规范捆绑包存在泛型问题.这是因为编译时使用jdk 1.4向后兼容的捆绑包使得它们在Jdk 7中中断.经过大量投诉后发布了符合以下规定的新版本jdk 7现在.

4.3.1源与4.3.0相同.它只是重新编译.您应该能够使用此jar编译代码.我不确定这与你使用的eclipse有什么关系,但我猜他们只是使用旧的编译规范类.

http://search.maven.org/remotecontent?filepath=org/osgi/org.osgi.core/4.3.1/org.osgi.core-4.3.1.jar