jsf - javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL 自 Java EE 7/EL 3.0 起不再工作

Question

<context-param>
    <param-name>javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL</param-name>
    <param-value>true</param-value>
</context-param>

不适用于 glassfish 4 和 wildfly 8 Final 上的最新 Mojarra 2.2.5

我已经看到了关于此的多个错误报告，Manfried Riem says ,

It was determined this is an EL issue and the EL implementation has been fixed to fix this

修复版本显示为 2.2.5，并且在 2.2.5 的发行说明中也有说明，我是否遗漏了什么？

Answer 1

使用自定义解析器修复:

faces-config.xml:

<application>
     <el-resolver>my.package.EmptyNullStringResolver</el-resolver>
</application>

EmptyNullStringResolver.java:

/**
 * @author pg
 */
public class EmptyNullStringResolver extends ELResolver {

    @Override
    public Class<?> getCommonPropertyType(ELContext context, Object base) {
        return String.class;
    }

    @Override
    public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) {
        return null;
    }

    @Override
    public Class<?> getType(ELContext context, Object base, Object property) {
        return null;
    }

    @Override
    public Object getValue(ELContext context, Object base, Object property) {
        return null;
    }

    @Override
    public boolean isReadOnly(ELContext context, Object base, Object property) {
        return true;
    }

    @Override
    public void setValue(ELContext context, Object base, Object property, Object value) {
    }

    @Override
    public Object convertToType(ELContext context, Object obj, Class<?> targetType) {
        if (String.class.equals(targetType) && obj instanceof String && ((String) obj).trim().isEmpty()) {
            context.setPropertyResolved(true);
        }
        return null;
    }
}