adding support to for CDATA when returning xml

[David Aranda]

Hello everyone , in the project i am working on, i need to add cdata to end result xml, since DropWizard uses jersey and it uses JAXB i was reading some articles about how to read , i successfully added the CDATA part by using a custom XmlAdapter but then end result was still being escaped , i was looking for a way to do that and i found this code but i don't know how to configure that on Dropwizard 

writer = new BufferedWriter(new FileWriter(selectedFile));
			context = JAXBContext.newInstance(Book.class);
			Marshaller m = context.createMarshaller();
			m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
			m.setProperty("com.sun.xml.internal.bind.characterEscapeHandler",
				new CharacterEscapeHandler() {
					@Override
					public void escape(char[] ch, int start, int length,
							boolean isAttVal, Writer writer)
							throws IOException {
						writer.write(ch, start, length);
					}
				});

also i've tried add a custom JAXBContext like is explained here:

https://automationrhapsody.com/rest-performance-problems-with-dropwizard-and-jersey-jaxb-provider/

and in the run method of my application i have this code 

final Client client = new JerseyClientBuilder(environment) 

                 .using(configuration.getJerseyClientConfiguration()) 

                 .withProvider(CustomJAXBContextConfiguration.class) 

                 .using(environment) .build(getName()); 

client.property(CharacterEscapeHandler.class.getName(),new CDataCharacterEscapeHandler()) ; 

environment.jersey().property(CharacterEscapeHandler.class.getName(),new CDataCharacterEscapeHandler()) ; 

environment.jersey().register(client); environment.jersey().register(CustomJAXBContextConfiguration.class);

but it doesn't work either,

is there a way to add a property to the marshaller jersey in Dropwizard is using ? or how i can achieve that 

thank you to all of you 

[Tatu Saloranta]

It would help if you explained in bit more detail what you try to achieve here.

Term "cdata", for example, has at least 2 meanings with XML (generally, "character data" for text contained; as well as CDATA sections

for manual escaping -- rarely produced by generators, and having no semantic difference from 'regular' textual content).

And if you are trying to force use of CDATA sections, follow-up question would be ... why? Given that it is not different, semantically,

from other text segments. It's just a convenience feature if manually modifying xml content, and processing systems are not allowed to

treat it any differently.

-+ Tatu +-

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[David Aranda]

Hello , with CDATA i mean this adding this <![CDATA[ textvalue ]]> to a xml value like this 

<message><![CDATA[ some embedded & xml</data>]]></message>

currently i was able to the <![CDATA[ ]]>  but the problem is the still jersey jaxb in dropwizard is still escaping it so it ends up like this:

<message>\&lt;![CDATA[Welcom some embedded &amp; xml</data]]&gt;></message>

and to answer you why i need that: its because when an xml has this section it can use characters '&' without the need to be converted to & for example

so its not the same, also this end xml is going to be consumed by other system which we had no way to modify.

thanks for your answer :D

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[Tatu Saloranta]

On Fri, Mar 16, 2018 at 3:17 PM, David Aranda <david....@globant.com> wrote:

Hello , with CDATA i mean this adding this <![CDATA[ textvalue ]]> to a xml value like this 

<message><![CDATA[ some embedded & xml</data>]]></message>

currently i was able to the <![CDATA[ ]]>  but the problem is the still jersey jaxb in dropwizard is still escaping it so it ends up like this:

<message>\&lt;![CDATA[Welcom some embedded &amp; xml</data]]&gt;></message>

and to answer you why i need that: its because when an xml has this section it can use characters '&' without the need to be converted to & for example

so its not the same, also this end xml is going to be consumed by other system which we had no way to modify.

Still, semantically content are no different; and escaping of `&` is automatically handled by XML writing library.

JAXB definitely adds such escaping as necessary. And on the other end, parser will unescape it (or handle CDATA section).

In the end different representations are exactly same and tools should not treat them any differently; ones that do can be considered broken.

Having said that, I don't know if there is a way to force JAXB to use CDATA sections; maybe someone else does.
I would just try to avoid the problem altogether and keep things simple.

Good luck!

-+ Tatu +-

 

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