OSGI 在发布时暴露一个 "ClassNotFoundException: org.w3c.dom.***"错误

Question

我只在 Activator.start() 函数中写了以下代码

    public void start(BundleContext bundleContext) throws Exception {
    Activator.context = bundleContext;
    Node node = new Node() {

        @Override
        public Object setUserData(String arg0, Object arg1, UserDataHandler arg2) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public void setTextContent(String arg0) throws DOMException {
            // TODO Auto-generated method stub

        }

        @Override
        public void setPrefix(String arg0) throws DOMException {
            // TODO Auto-generated method stub

        }

        @Override
        public void setNodeValue(String arg0) throws DOMException {
            // TODO Auto-generated method stub

        }

        @Override
        public Node replaceChild(Node arg0, Node arg1) throws DOMException {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public Node removeChild(Node arg0) throws DOMException {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public void normalize() {
            // TODO Auto-generated method stub
            System.out.println("normalize 方法调用");

        }

        @Override
        public String lookupPrefix(String arg0) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public String lookupNamespaceURI(String arg0) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public boolean isSupported(String arg0, String arg1) {
            // TODO Auto-generated method stub
            return false;
        }

        @Override
        public boolean isSameNode(Node arg0) {
            // TODO Auto-generated method stub
            return false;
        }

        @Override
        public boolean isEqualNode(Node arg0) {
            // TODO Auto-generated method stub
            return false;
        }

        @Override
        public boolean isDefaultNamespace(String arg0) {
            // TODO Auto-generated method stub
            return false;
        }

        @Override
        public Node insertBefore(Node arg0, Node arg1) throws DOMException {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public boolean hasChildNodes() {
            // TODO Auto-generated method stub
            return false;
        }

        @Override
        public boolean hasAttributes() {
            // TODO Auto-generated method stub
            return false;
        }

        @Override
        public Object getUserData(String arg0) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public String getTextContent() throws DOMException {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public Node getPreviousSibling() {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public String getPrefix() {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public Node getParentNode() {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public Document getOwnerDocument() {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public String getNodeValue() throws DOMException {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public short getNodeType() {
            // TODO Auto-generated method stub
            return 0;
        }

        @Override
        public String getNodeName() {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public Node getNextSibling() {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public String getNamespaceURI() {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public String getLocalName() {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public Node getLastChild() {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public Node getFirstChild() {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public Object getFeature(String arg0, String arg1) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public NodeList getChildNodes() {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public String getBaseURI() {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public NamedNodeMap getAttributes() {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public short compareDocumentPosition(Node arg0) throws DOMException {
            // TODO Auto-generated method stub
            return 0;
        }

        @Override
        public Node cloneNode(boolean arg0) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public Node appendChild(Node arg0) throws DOMException {
            // TODO Auto-generated method stub
            return null;
        }
    };
    node.normalize();
}

在eclipse环境下运行一切正常，但是，发布产品时，运行时日志中出现错误:

根异常:
java.lang.NoClassDefFoundError: org/w3c/dom/Node

引起:java.lang.ClassNotFoundException:org.w3c.dom.Node

任何人都可以提供一些帮助吗？

Answer 1

OSGi 允许访问系统包，但默认情况下只有 java.* 包，这不包括其他包，如: javax.net 、 javax.xml 、 com.sun

因此，有必要为 OSGi 框架指定任何此类包，以通过系统包导出它们，从而使导入它们的其他包可以访问它们。

为此，您需要使用捆绑包所需的附加包设置配置属性，请尝试在启动 OSGi 框架之前将其设置为系统属性，以便它在首次启动时获取此属性。

假设您使用的是 OSGi 4.2，该属性将配置为:

org.osgi.framework.system.packages.extra=org.w3c.dom

您可能需要查看 Apache Felix Framework Configuration Properties有关更多详细信息，尽管此属性是 OSGi 规范的一部分，因此也应在其他实现中可用