javax.ws.rs.core.PathSegment和Errai

Question

Errai has support for JAX-RS，雖然當我試圖與供應Maven archetype使用GWT抱怨與錯誤：

No source code is available for type javax.ws.rs.core.PathSegment; did you forget to inherit a required module? 

The PathSegment interface appears to be part of the official Java EE standard，那麼，爲什麼是這個類不可用？

Answer 1

解決方案是在您的GWT項目中創建javax.ws.rs.core包，併爲您自己包含接口。這些接口MultivaluedMap：

package javax.ws.rs.core; 

import java.util.List; 
import java.util.Map; 

/** 
* A map of key-values pairs. Each key can have zero or more values. 
* 
*/ 
public interface MultivaluedMap<K, V> extends Map<K, List<V>> { 

    /** 
    * Set the key's value to be a one item list consisting of the supplied value. 
    * Any existing values will be replaced. 
    * 
    * @param key the key 
    * @param value the single value of the key 
    */ 
    void putSingle(K key, V value); 

    /** 
    * Add a value to the current list of values for the supplied key. 
    * @param key the key 
    * @param value the value to be added. 
    */ 
    void add(K key, V value); 

    /** 
    * A shortcut to get the first value of the supplied key. 
    * @param key the key 
    * @return the first value for the specified key or null if the key is 
    * not in the map. 
    */ 
    V getFirst(K key); 

} 

PathSegment：

package javax.ws.rs.core; 

/** 
* Represents a URI path segment and any associated matrix parameters. When an 
* instance of this type is injected with {@link javax.ws.rs.PathParam}, the 
* value of the annotation identifies which path segment is selected and the 
* presence of an {@link javax.ws.rs.Encoded} annotation will result in an 
* instance that supplies the path and matrix parameter values in 
* URI encoded form. 
* 
* @see UriInfo#getPathSegments 
* @see javax.ws.rs.PathParam 
*/ 
public interface PathSegment 
{ 

    /** 
    * Get the path segment. 
    * <p/> 
    * 
    * @return the path segment 
    */ 
    String getPath(); 

    /** 
    * Get a map of the matrix parameters associated with the path segment. 
    * The map keys are the names of the matrix parameters with any 
    * percent-escaped octets decoded. 
    * 
    * @return the map of matrix parameters 
    * @see <a href="http://www.w3.org/DesignIssues/MatrixURIs.html">Matrix URIs</a> 
    */ 
    MultivaluedMap<String, String> getMatrixParameters(); 

} 

你需要一個GWT模塊文件（在javax.ws.rs包）：

<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 1.6//EN" 
     "http://google-web-toolkit.googlecode.com/svn/releases/1.6/distro-source/core/src/gwt-module.dtd"> 
<module rename-to="App"> 
    <source path="core"/> 
</module> 

你」您需要爲您的應用程序GWT模塊添加一個繼承引用：

<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 1.6//EN" 
     "http://google-web-toolkit.googlecode.com/svn/releases/1.6/distro-source/core/src/gwt-module.dtd"> 
<module rename-to="App"> 
    <inherits name='com.google.gwt.user.User'/> 
    <inherits name="org.jboss.errai.common.ErraiCommon"/> 
    <inherits name="org.jboss.errai.ioc.Container"/> 

    <inherits name="org.jboss.errai.enterprise.Jaxrs"/> 
    <inherits name="com.redhat.topicindex.rest"/> 
    <inherits name="javax.ws.rs.core"/> 
</module>