Creating a simple custom tag to show or hide body

Im trying to create my own custom tag so i can display or hide the content between the tag depending on an attribute set.

<开发者_Python百科;mytag:isUserInRole role="admin">Show admin specific text</mytag:isUserInRole>`

Basicly i want to show the text between the tags if the logged in user has role==admin. I thought it would be easy, but so far i've had no luck. If i in my tld-file set <body-content>empty</body-content> I get this exception:

"According to TLD, tag auth:isUserInRole must be empty, but is not"

If i set <body-content /> i get this one:

Unable to compile class for JSP - Caused by: java.lang.NullPointerException at org.apache.jasper.compiler.Parser.parseBody(Parser.java:1857)

Can anyone see what im doing wrong?

Her is my tld-files relevant tag:

    <tag>
    <name>isUserInRole</name>
    <tag-class>no.mycompany.tag.AuthorizationTag</tag-class>
    <body-content />
    <attribute>
        <name>role</name>
        <required>true</required>
        <rtexprvalue>false</rtexprvalue>
    </attribute>
</tag>

And here is my AuthorizationTag doStartTag-method:

    public int doStartTag() throws JspException{
    System.out.println("Role"+role);

    //Check that role is given and securitycontext is not null
    if(role==null|| SecurityContextHolder.getContext()==null || SecurityContextHolder.getContext().getAuthentication()==null){
        return Tag.SKIP_BODY;
    }
    Authentication auth = SecurityContextHolder.getContext().getAuthentication();

    if(hasPermission(auth)){
        return Tag.EVAL_BODY_INCLUDE;
    } else {
        return Tag.SKIP_BODY;
    }
}

Try this: <bodycontent>jsp</bodycontent>, also note the difference between <body-content> and <bodycontent>

As I know there is a taglib uri="http://www.springframework.org/security/tags" which does exactly you are trying to achieve - it has <authorize> tag. If you don't want use it, you could investigate the source code, e.g. org.springframework.faces.security.FaceletsAuthorizeTagHandler.