【发布时间】：2012-12-18 05:40:43
【问题描述】：
以下代码在使用 JDK7 的 Eclipse 中编译没有任何问题（我使用的是更新 10，但应该可以使用任何版本的 JDK7 重现），但在使用完全相同的 JDK 通过命令行编译时会失败。该类仅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here下载
我正在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
【问题讨论】：
-
你检查了eclipse项目目录下的.classpath文件了吗？它为您提供了要包含在类路径中的所有 jar 文件
-
@BhavikShah：是的，我做到了。它仅包含 JDK 和上述 jar 文件的条目。