Tomcat (TomEE)/9.0.12 (8.0.0-M1) JSF 2.3 - Empty Strings from form inputs expected as NULL

[Ted Spradley]

What is the current way of coercing empty string input fields to NULL With 
9.0.12? This issue seems to come up with each new major version of EL/JSF.

 

All of the previous work arounds are no longer producing null values. Surely 
I’m missing something obvious that has been published.

 

Web.xml

  <context-param>

    
<param-name>javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL</param-name>

    <param-value>true</param-value>

  </context-param> 

       <context-param>     

         <param-name>org.apache.myfaces.EXPRESSION_FACTORY</param-name>

         <param-value>com.sun.el.ExpressionFactoryImpl</param-value>   

       </context-param>

 

Dropping the javax.el-3.0.1-b11.jar in WEB-INF/lib seems to have no effect.

 

Faces-config.xml

       <application>

           <el-resolver>com.example.EmptyToNullStringELResolver</el-resolver>

       </application> 

 

Custom el resolver causes a null pointer exception

 

java.lang.NullPointerException

    at 
org.apache.myfaces.shared.resource.ValueExpressionFilterInputStream.read(ValueExpressionFilterInputStream.java:130)

    at java.io.InputStream.read(InputStream.java:179)

    at 
java.nio.channels.Channels$ReadableByteChannelImpl.read(Channels.java:385)

    at org.omnifaces.util.Utils.stream(Utils.java:397)

    at 
org.omnifaces.resourcehandler.UnmappedResourceHandler.handleResourceRequest(UnmappedResourceHandler.java:176)

    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:196)

    at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)

    at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

    at ...

 

 

 

Thank you,

Ted S.