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 // Copyright 2007, 2008 The Apache Software Foundation
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 // Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package org.apache.tapestry5;
Utility methods related to managing framework version numbers.
public class VersionUtils

Reads a version number from a properties file on the classpath. These files are generally created by Maven. For example, tapestry-core's properties file is META-INF/maven/org.apache.tapestry/tapestry-core/ The Maven generated properties files include the artifact id and group id as well as the version.

The resource is located using the Thread's context class loader.

resourcePath the complete path to the resource, including a leading slash.
the version number read from the properties file, or "UNKNOWN" if the version number is not present or the file can not be opened
    public static String readVersionNumber(String resourcePath)
        String result = "UNKNOWN";
        if (stream != null)
            Properties properties = new Properties();
                stream = new BufferedInputStream(stream);
            catch (IOException ex)
                // Just ignore it.
            String version = properties.getProperty("version");
            // Since the file, if it exists, is created by Maven and will have the key, I can't see
            // how version would EVER be null, unless there's a problem reading the properties.
            if (version != nullresult = version;
        return result;
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