Source Code

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    <%@ taglib prefix="my" uri="http://tomcat.apache.org/example-taglib" %>

    <html>
      <head>
        <title>JSP 2.0 Expression Language - Composite Expressions</title>
      </head>
      <body>
        <h1>JSP 2.0 Expression Language - Composite Expressions</h1>
        <hr>
        This example illustrates EL composite expressions. Composite expressions
        are formed by grouping together multiple EL expressions. Each of them is
        evaluated from left to right, coerced to String, all those strings are
        concatenated, and the result is coerced to the expected type.

        <jsp:useBean id="values" class="jsp2.examples.ValuesBean" />

        <blockquote>
          <code>
            <table border="1">
              <thead>
            <td><b>EL Expression</b></td>
            <td><b>Type</b></td>
            <td><b>Result</b></td>
          </thead>
          <tr>
            <td>\${'hello'} wo\${'rld'}</td>
            <td>String</td>
            <td><jsp:setProperty name="values" property="stringValue" value="${'hello'} wo${'rld'}"/>${values.stringValue}</td>
          </tr>
          <tr>
            <td>\${'hello'} wo\${'rld'}</td>
            <td>String</td>
            <td><my:values string="${'hello'} wo${'rld'}"/></td>
          </tr>
          <tr>
            <td>\${1+2}.\${220}</td>
            <td>Double</td>
            <td><jsp:setProperty name="values" property="doubleValue" value="${1+2}.${220}"/>${values.doubleValue}</td>
          </tr>
          <tr>
            <td>\${1+2}.\${220}</td>
            <td>Double</td>
            <td><my:values double="${1+2}.${220}"/></td>
          </tr>
          <tr>
            <td>000\${1}\${7}</td>
            <td>Long</td>
            <td><jsp:setProperty name="values" property="longValue" value="000${1}${7}"/>${values.longValue}</td>
          </tr>
          <tr>
            <td>000\${1}\${7}</td>
            <td>Long</td>
            <td><my:values long="000${1}${7}"/></td>
          </tr>
          <!--
             Undefined values are to be coerced to String, to be "",
             https://bz.apache.org/bugzilla/show_bug.cgi?id=47413
           -->
          <tr>
            <td>\${undefinedFoo}hello world\${undefinedBar}</td>
            <td>String</td>
            <td><jsp:setProperty name="values" property="stringValue" value="${undefinedFoo}hello world${undefinedBar}"/>${values.stringValue}</td>
          </tr>
          <tr>
            <td>\${undefinedFoo}hello world\${undefinedBar}</td>
            <td>String</td>
            <td><my:values string="${undefinedFoo}hello world${undefinedBar}"/></td>
          </tr>
          <tr>
            <td>\${undefinedFoo}\${undefinedBar}</td>
            <td>Double</td>
            <td><jsp:setProperty name="values" property="doubleValue" value="${undefinedFoo}${undefinedBar}"/>${values.doubleValue}</td>
          </tr>
          <tr>
            <td>\${undefinedFoo}\${undefinedBar}</td>
            <td>Double</td>
            <td><my:values double="${undefinedFoo}${undefinedBar}"/></td>
          </tr>
          <tr>
            <td>\${undefinedFoo}\${undefinedBar}</td>
            <td>Long</td>
            <td><jsp:setProperty name="values" property="longValue" value="${undefinedFoo}${undefinedBar}"/>${values.longValue}</td>
          </tr>
          <tr>
            <td>\${undefinedFoo}\${undefinedBar}</td>
            <td>Long</td>
            <td><my:values long="${undefinedFoo}${undefinedBar}"/></td>
          </tr>
        </table>
          </code>
        </blockquote>
      </body>
    </html>