Creating your first servlet in AEM Forms | AEM Community Blog Seeding

[kautuk_sahni]

Creating your first servlet in AEM Forms by Adobe Docs

Abstract

Sling Servlet
A Servlet is a class used to extend the capabilities of servers that host applications accessed by means of a request-response programming model. For such applications, Servlet technology defines HTTP-specific servlet classes.
All servlets must implement the Servlet interface, which defines life-cycle methods.

A servlet in AEM can be registered as OSGi service: you can extend SlingSafeMethodsServlet for read-only implementation or SlingAllMethodsServlet in order to implement all RESTful operations.

Servlet Code
import javax.servlet.Servlet;

import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.servlets.SlingAllMethodsServlet;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;

import com.adobe.aemfd.docmanager.Document;
import com.adobe.fd.forms.api.FormsService;

@Component(service={Servlet.class}, property={"sling.servlet.methods=post", "sling.servlet.paths=/bin/mergedataWithAcroform"})
public class MyFirstAEMFormsServlet extends SlingAllMethodsServlet
{

private static final long serialVersionUID = 1L;
@Reference
FormsService formsService;
protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response)
{
String file_path = request.getParameter("save_location");

java.io.InputStream pdf_document_is = null;
java.io.InputStream xml_is = null;
javax.servlet.http.Part pdf_document_part = null;
javax.servlet.http.Part xml_data_part = null;
try
{
pdf_document_part = request.getPart("pdf_file");
xml_data_part = request.getPart("xml_data_file");
pdf_document_is = pdf_document_part.getInputStream();
xml_is = xml_data_part.getInputStream();
Document data_merged_document = formsService.importData(new Document(pdf_document_is), new Document(xml_is));
data_merged_document.copyToFile(new File(file_path));

}
catch(Exception e)
{
response.sendError(400,e.getMessage());
}
}
}

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Creating your first servlet in AEM Forms

Q&A

Please use this thread to ask the related questions.

[AndrewKeys123]

Hello,

When I take this tutorial and test on Postman, I get the following error:

Error while processing /bin/mergedataWithAcroform

Status	500
Message	org.apache.sling.api.resource.PersistenceException: Unable to create node at /bin/mergedataWithAcroform
Location	/bin/mergedataWithAcroform
Parent Location	bin
Path	/bin/mergedataWithAcroform
Referer
ChangeLog

Would you have suggestions on this?  

I am new to using Postman.  I set up the test based on the screenshot in the tutorial.  I added the 3 key value pairs in the "Body".  I selected Basic Authorization in Authorization.  (10 headers)  

Thank you,

Andrew