Velocity can't find resource

问题:

Something is wrong and it is very frustrating. I read on velocity's homepage that when I run a webapp then some properties should be set. And I've done that but no matter what I do I keep getting the same error.
This is where I set the props and use velocity

public class ConfirmationMailGenerator implements MailGenerator {      private BasicUser user;     private String htmlTemplate = "HTMLConfirmationMailTemplate.vsl";     private String plainTemplate = "PlainConfirmationMailTemplate.vsl";      public ConfirmationMailGenerator(BasicUser user) {         this.user = user;     }      public StringWriter generateHTML() throws Exception {         Properties props = new Properties();         props.setProperty("resource.loader", "wepapp");         props.setProperty("webapp.resource.loader.class", "org.apache.velocity.tools.view.WebappResourceLoader");         props.setProperty("webapp.resource.loader.path", "/WEB-INF/mailtemplates/");         VelocityEngine engine = new VelocityEngine(props);         VelocityContext context = new VelocityContext();          engine.init();          Map map = createDataModel();         context.put("user", map);          Template template = engine.getTemplate(htmlTemplate);         StringWriter writer = new StringWriter();         template.merge(context, writer);          return writer;     } ... } 

The files is of course saved in /WEB-INF/mailtemplates/.
If I use this I get this error:

SEVERE: ResourceManager : unable to find resource 'HTMLConfirmationMailTemplate.vsl' in any resource loader. SEVERE: The log message is null. 

Thank you for your time:)

回答1:

You are using the Webapp resourceloader, which is intended for pages served by the Velocity Tools servlet. (It requires some special initialization to find the root of the servlet context).

I recommend you use the ClasspathResourceLoader, then put the files into WEB-INF/classes, or elsewhere in your classpath. This is really the most straight forward approach.

resource.loader = class class.resource.loader.class = org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader 

More info is here:

https://velocity.apache.org/engine/1.7/apidocs/org/apache/velocity/runtime/resource/loader/ClasspathResourceLoader.html

回答2:

Will Glass answer is correct, but the configuration should be:

resource.loader = class class.resource.loader.class = org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader 

Note the class at the beginning of the second line. See the links provided by him for more details!.

Note: Making an answer instead of a comment due to privileges.

回答3:

Velocity is probably using the class loader to find those files. I'd recommend putting them in WEB-INF/classes, which is in the CLASSPATH by default.

回答4:

I am fine it as follow,

In velocity.properties file

resource.loader=class, file class.resource.loader.class=org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader file.resource.loader.class=org.apache.velocity.runtime.resource.loader.FileResourceLoader file.resource.loader.path=vm_template runtime.log.logsystem.class=org.apache.velocity.runtime.log.SimpleLog4JLogSystem runtime.log.logsystem.log4j.category=velocity input.encoding=UTF-8 output.encoding=UTF-8 

And at my java class

import java.io.StringWriter; import java.util.Properties; import org.apache.log4j.Logger; import org.apache.velocity.Template; import org.apache.velocity.VelocityContext; import org.apache.velocity.app.Velocity; import org.apache.velocity.exception.ParseErrorException; import org.apache.velocity.exception.ResourceNotFoundException; import org.apache.velocity.tools.generic.DateTool; import org.apache.velocity.tools.generic.EscapeTool; import org.apache.velocity.tools.generic.LoopTool; import org.apache.velocity.tools.generic.MathTool; import org.apache.velocity.tools.generic.NumberTool; import org.apache.velocity.tools.generic.SortTool; import org.springframework.beans.factory.InitializingBean; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.core.io.ClassPathResource; import org.springframework.core.io.Resource;  public class VelocitySupport implements InitializingBean { private static Logger log = Logger.getLogger(VelocitySupport.class);  @Autowired private Properties properties;  public final void afterPropertiesSet() throws Exception {     location = location.replace("classpath:", "");     Resource res = new ClassPathResource(location);      Properties prop = new Properties();     prop.load(res.getInputStream());      String staticDir = System.getProperty("staticDir");     String tempPath = prop.getProperty("file.resource.loader.path");     tempPath = staticDir + "/" + tempPath;      prop.setProperty("file.resource.loader.path", tempPath);     Velocity.init(prop); }  public static String merge(final String template, final VelocityContext vc) throws Exception {     try {         vc.put("date", new DateTool());         vc.put("escape", new EscapeTool());         vc.put("math", new MathTool());         vc.put("number", new NumberTool());         vc.put("iterate", new LoopTool());         vc.put("sort", new SortTool());          Template temp = Velocity.getTemplate(template);          StringWriter sw = new StringWriter();         temp.merge(vc, sw);         sw.flush();          return sw.toString();     }     catch (ResourceNotFoundException e) {         log.error("", e);         throw e;     }     catch (ParseErrorException e) {         log.error("", e);         throw e;     } }  private String location;  public final void setLocation(final String location) {     this.location = location; } } 

And insert VM arguments of project as follow..

-DstaticDir= "your directory for template path" 

That may be helpful for you...

回答5:

For resolving this error --WEB-INF/classes and all the JARs in WEB-INF/lib are in the CLASSPATH. Try moving your folder with the .vm files under WEB-INF/classes --dont put the abolute path eg. if abc.vm file is in /public_html/WEB-INF folder then put path = "/public_html/WEB-INF/abc.vm" for velocity template path.

文章来源: Velocity can't find resource