OSGI 中的 Java 货币引用实现

Question

我正在使用此处的 Java money (JSR354) 引用实现:http://javamoney.github.io/ri.html

但是，我在 OSGI 环境中使用它。这给了我以下异常(exception):

[qtp305372452-33] ERROR org.javamoney.moneta.spi.MonetaryConfig - Error loading javamoney.properties, ignoring bundleresource://7.fwk302155142:3/javamoney.properties
java.lang.IllegalStateException: AmbiguousConfiguration detected for 'load.ECBHistoricRateProvider.resource'.
    at org.javamoney.moneta.spi.MonetaryConfig.updateConfig(MonetaryConfig.java:90)
    at org.javamoney.moneta.spi.MonetaryConfig.<init>(MonetaryConfig.java:53)
    at org.javamoney.moneta.spi.MonetaryConfig.<clinit>(MonetaryConfig.java:39)
    at org.javamoney.moneta.DefaultMonetaryContextFactory.getContext(DefaultMonetaryContextFactory.java:38)
    at org.javamoney.moneta.Money.<clinit>(Money.java:79)
    at org.javamoney.moneta.internal.MoneyAmountBuilder.create(MoneyAmountBuilder.java:42)
    at org.javamoney.moneta.internal.MoneyAmountBuilder.create(MoneyAmountBuilder.java:33)
    at org.javamoney.moneta.spi.AbstractAmountBuilder.create(AbstractAmountBuilder.java:61)
    at com.eijsink.ef.module.pricing.Price.createAmount(Price.java:214)
    at com.eijsink.ef.module.pricing.Price.<init>(Price.java:73)
    at com.eijsink.ef.module.pricing.view.PriceField.storeValue(PriceField.java:210)
    at com.eijsink.ef.module.pricing.view.PriceField.lambda$6(PriceField.java:169)
    at com.eijsink.ef.module.pricing.view.PriceField$$Lambda$163/23040973.valueChange(Unknown Source)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:508)
    at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:198)
    at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:161)
    at com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:977)
    at com.vaadin.ui.AbstractField.fireValueChange(AbstractField.java:1137)
    at com.vaadin.ui.AbstractField.setValue(AbstractField.java:548)
    at com.vaadin.ui.AbstractSelect.setValue(AbstractSelect.java:709)
    at com.vaadin.ui.ComboBox.changeVariables(ComboBox.java:674)
    at com.vaadin.server.communication.ServerRpcHandler.changeVariables(ServerRpcHandler.java:486)
    at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:305)
    at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:184)
    at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:92)
    at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:41)
    at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1408)
    at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:350)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
    at org.eclipse.equinox.http.servlet.internal.ServletRegistration.service(ServletRegistration.java:61)
    at org.eclipse.equinox.http.servlet.internal.ProxyServlet.processAlias(ProxyServlet.java:128)
    at org.eclipse.equinox.http.servlet.internal.ProxyServlet.service(ProxyServlet.java:76)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
    at org.eclipse.equinox.http.jetty.internal.HttpServerManager$InternalHttpServiceServlet.service(HttpServerManager.java:386)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:501)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:229)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:533)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1088)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
    at org.eclipse.jetty.server.Server.handle(Server.java:370)
    at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)
    at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:982)
    at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1043)
    at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
    at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
    at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:667)
    at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
    at java.lang.Thread.run(Thread.java:744)

使用 Java 货币类时不会抛出异常，而只会记录异常。一切正常，但我的日志中一直弹出此异常，这对我和我的同事来说非常烦人。

我已经将问题追溯到库中的这个类:

package org.javamoney.moneta.spi;

//imports

public final class MonetaryConfig {

    private static final Logger LOG = Logger
            .getLogger(MonetaryConfig.class.getName());

    private static final MonetaryConfig INSTANCE = new MonetaryConfig();

    private Map<String, String> config = new HashMap<>();
    private Map<String, Integer> priorities = new HashMap<>();

    private MonetaryConfig() {
        try {
            Enumeration<URL> urls = getClass().getClassLoader().getResources(
                    "javamoney.properties");
            while (urls.hasMoreElements()) {
                URL url = urls.nextElement();
                try {
                    Properties props = new Properties();
                    props.load(url.openStream());
                    updateConfig(props);
                } catch (Exception e) {
                    LOG.log(Level.SEVERE,
                            "Error loading javamoney.properties, ignoring "
                                    + url, e);
                }
            }
        } catch (IOException e) {
            LOG.log(Level.SEVERE, "Error loading javamoney.properties.", e);
        }
    }

    private void updateConfig(Properties props) {
        for (Map.Entry<Object, Object> en : props.entrySet()) {
            String key = en.getKey().toString();
            String value = en.getValue().toString();
            int prio = 0;
            if (key.startsWith("{")) {
                int index = key.indexOf('}');
                if (index > 0) {
                    String prioString = key.substring(1, index);
                    try {
                        prio = Integer.parseInt(prioString);
                        key = key.substring(index + 1);
                    } catch (NumberFormatException e) {
                        LOG.warning("Invalid config key in javamoney.properties: " + key);
                    }
                }
            }
            Integer existingPrio = priorities.get(key);
            if (Objects.isNull(existingPrio)) {
                priorities.put(key, prio);
                config.put(key, value);
            } else if (existingPrio < prio) {
                priorities.put(key, prio);
                config.put(key, value);
            } else if (existingPrio == prio) {
                throw new IllegalStateException(
                        "AmbiguousConfiguration detected for '" + key + "'.");
            }
            // else ignore entry with lower prio!
        }
    }

    public static Map<String, String> getConfig() {
        return Collections.unmodifiableMap(INSTANCE.config);
    }

}

updateConfig() 方法抛出异常。 MonetaryConfig 构造函数记录它。出现问题是因为行

Enumeration<URL> urls = getClass().getClassLoader().getResources(
                "javamoney.properties");

返回同一文件的 2 个 URL，即:“bundleresource://7.fwk302155142/javamoney.properties”和“bundleresource://7.fwk302155142:3/javamoney.properties”。

我检查了 .JAR 文件，只有 1 个属性文件，它肯定被读取了两次。

问题的真正根源在于资源的加载方式。在 OSGI 中，这不是加载资源的方式(您应该从您的包中获取资源)。但是，我不知道如何修改这个库加载资源的方式(除了修改和重新编译源代码，我不想这样做)。

加载此库时是否可以使用任何 OSGI 技术使其正常工作？

编辑:我的 list 包类路径

Bundle-ClassPath: jars/moneta-1.0-RC3.jar,
 jars/money-api-1.0-RC3.jar,
 jars/javax.annotation-api-1.2.jar

Answer 1

来自网址:

bundleresource://7.fwk302155142/javamoney.properties
bundleresource://7.fwk302155142:3/javamoney.properties

由于 Bundle-Classpath，资源似乎在其中两次。 :3 应该引用 Bundle-Classpath 中的索引。确保 Bundle-Classpath 中没有条目包含属性文件。