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only activate EL support if JSP ExpressionFactory actually available (SPR-6852)

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This commit is contained in:
Juergen Hoeller
2010-02-17 21:54:21 +00:00
parent 6aa05994ae
commit 36940c5fc8
2 changed files with 35 additions and 13 deletions
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41
org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/view/tiles2/TilesConfigurer.java
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@@ -26,6 +26,7 @@ import java.util.List;
import java.util.Map;
import java.util.Properties;
import javax.servlet.ServletContext;
import javax.servlet.jsp.JspFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
@@ -143,8 +144,6 @@ public class TilesConfigurer implements ServletContextAware, InitializingBean, D
Boolean.toString(false));
this.tilesPropertyMap.put(DefinitionsFactory.LOCALE_RESOLVER_IMPL_PROPERTY,
SpringLocaleResolver.class.getName());
this.tilesPropertyMap.put(TilesContainerFactory.ATTRIBUTE_EVALUATOR_INIT_PARAM, tilesElPresent ?
"org.apache.tiles.evaluator.el.ELAttributeEvaluator" : DirectAttributeEvaluator.class.getName());
}
@@ -288,6 +287,15 @@ public class TilesConfigurer implements ServletContextAware, InitializingBean, D
* @see #createTilesInitializer()
*/
public void afterPropertiesSet() throws TilesException {
boolean activateEl = false;
if (tilesElPresent) {
activateEl = new JspExpressionChecker().isExpressionFactoryAvailable();
if (!this.tilesPropertyMap.containsKey(TilesContainerFactory.ATTRIBUTE_EVALUATOR_INIT_PARAM)) {
this.tilesPropertyMap.put(TilesContainerFactory.ATTRIBUTE_EVALUATOR_INIT_PARAM, activateEl ?
"org.apache.tiles.evaluator.el.ELAttributeEvaluator" : DirectAttributeEvaluator.class.getName());
}
}
SpringTilesApplicationContextFactory factory = new SpringTilesApplicationContextFactory();
factory.init(this.tilesPropertyMap);
TilesApplicationContext preliminaryContext = factory.createApplicationContext(this.servletContext);
@@ -300,6 +308,7 @@ public class TilesConfigurer implements ServletContextAware, InitializingBean, D
// We need to do this after initialization simply because we're reusing the
// original CompleteAutoloadTilesInitializer above. We cannot subclass
// CompleteAutoloadTilesInitializer when compiling against Tiles 2.1...
logger.debug("Registering Tiles 2.2 LocaleResolver for complete-autoload setup");
try {
BasicTilesContainer container = (BasicTilesContainer) ServletUtil.getContainer(this.servletContext);
DefinitionsFactory definitionsFactory = container.getDefinitionsFactory();
@@ -311,12 +320,12 @@ public class TilesConfigurer implements ServletContextAware, InitializingBean, D
}
}
if (tilesElPresent && this.tilesInitializer instanceof SpringTilesInitializer) {
if (activateEl && this.tilesInitializer instanceof SpringTilesInitializer) {
// Again, we need to do this after initialization since SpringTilesContainerFactory
// cannot override template methods that refer to Tiles 2.2 classes: in this case,
// AttributeEvaluatorFactory as createAttributeEvaluatorFactory return type.
BasicTilesContainer container = (BasicTilesContainer) ServletUtil.getContainer(this.servletContext);
TilesElActivator.registerEvaluator(container);
new TilesElActivator().registerEvaluator(container);
}
}
@@ -423,9 +432,29 @@ public class TilesConfigurer implements ServletContextAware, InitializingBean, D
}
private static class TilesElActivator {
private class JspExpressionChecker {
public static void registerEvaluator(BasicTilesContainer container) {
public boolean isExpressionFactoryAvailable() {
try {
JspFactory factory = JspFactory.getDefaultFactory();
if (factory != null &&
factory.getJspApplicationContext(servletContext).getExpressionFactory() != null) {
logger.info("Found JSP 2.1 ExpressionFactory");
return true;
}
}
catch (Throwable ex) {
logger.warn("Could not obtain JSP 2.1 ExpressionFactory", ex);
}
return false;
}
}
private class TilesElActivator {
public void registerEvaluator(BasicTilesContainer container) {
logger.debug("Registering Tiles 2.2 AttributeEvaluatorFactory for JSP 2.1");
try {
ClassLoader cl = TilesElActivator.class.getClassLoader();
Class aef = cl.loadClass("org.apache.tiles.evaluator.AttributeEvaluatorFactory");