2.7.0版本getContextPath方法：
```
protected String getContextPath(URL url) {
        String contextPath = url.getPath();
        return contextPath.endsWith("/") ? contextPath.substring(0,contextPath.length()-1) : contextPath;
    }
```
无法将方法置入web容器中，退回2.6.5版本的方法：
```
protected String getContextPath(URL url) {
        int pos = url.getPath().lastIndexOf("/");
        return pos > 0 ? url.getPath().substring(0, pos) : "";
    }
```
使用正常，两个方法应该不等价的。
}
    }
    
    public String[] getParamsToRegistry(String[] defaultKeys, String[] additionalParameterKeys) {
        int additionalLen = additionalParameterKeys.length;
        String[] registryParams = new String[defaultKeys.length + additionalLen];
        System.arraycopy(defaultKeys, 0, registryParams, 0, defaultKeys.length);
        System.arraycopy(additionalParameterKeys, 0, registryParams, defaultKeys.length, additionalLen);
        return registryParams;
    }
    @Override
    public void destroy() {
        List<Exporter<?>> exporters = new ArrayList<Exporter<?>>(bounds.values());
        for (Exporter<?> exporter : exporters) {
            exporter.unexport();
        }
        bounds.clear();
        DynamicConfiguration.getDynamicConfiguration()
                .removeListener(ApplicationModel.getApplication() + CONFIGURATORS_SUFFIX, providerConfigurationListener);
    }
    
    private static URL getConfigedInvokerUrl(List<Configurator> configurators, URL url) {
        if (configurators != null && configurators.size() > 0) {
            for (Configurator configurator : configurators) {
                url = configurator.configure(url);
            }
        }
        return url;
    }
    public static class InvokerDelegate<T> extends InvokerWrapper<T> {