Fix internal server error

CreateConfluencePage.groovy

package examples.docs

import com.atlassian.applinks.api.ApplicationLink
import com.atlassian.applinks.api.ApplicationLinkService
import com.atlassian.applinks.api.application.confluence.ConfluenceApplicationType
import com.atlassian.jira.issue.Issue
import com.atlassian.sal.api.component.ComponentLocator
import com.atlassian.sal.api.net.Request
import com.atlassian.sal.api.net.Response
import com.atlassian.sal.api.net.ResponseException
import com.atlassian.sal.api.net.ResponseHandler
import groovy.json.JsonBuilder
import groovy.xml.MarkupBuilder


def ApplicationLink getPrimaryConfluenceLink() {
    def applicationLinkService = ComponentLocator.getComponent(ApplicationLinkService.class)
    final ApplicationLink conflLink = applicationLinkService.getPrimaryApplicationLink(ConfluenceApplicationType.class);
    conflLink
}

// the issue provided to us in the binding
Issue issue = issue

// if you don't want to create confluence pages based on some criterion like issue type, handle this, eg:
if (!issue.getIssueType() == "Bug") {
    return
}

def confluenceLink = getPrimaryConfluenceLink()
assert confluenceLink // must have a working app link set up

def authenticatedRequestFactory = confluenceLink.createAuthenticatedRequestFactory()

// write storage format using an XML builder
def writer = new StringWriter()
def xml = new MarkupBuilder(writer)
xml.p("some thing here")
xml.'ac:structured-macro' ('ac:name': "jira") {
    'ac:parameter' ('ac:name': "server", "127.0.0.1 JIRA")
    'ac:parameter' ('ac:name': "serverId", "12345678-1234-1234-1234-1234567890")
    'ac:parameter' ('ac:name': "key", issue.key)
}

// add more paragraphs etc
xml.p ("Some additional info here.")

// print the storage that will be the content of the page
log.debug(writer.toString())

// set the page title - this should be unique in the space or page creation will fail
def pageTitle = issue.key + issue.summary

def params = [
    type: "page",
    title: pageTitle,
    space: [
        key: "NGP" // set the space key - or calculate it from the project or something
    ],
    /* // if you want to specify create the page under another, do it like this:
	*/
		ancestors: [
         [
             type: "page",
             id: "1015846",
         ]    
    ],
    body: [
        storage: [
            value: writer.toString(), 
            representation: "storage" 
        ]
    ]
]

authenticatedRequestFactory
    .createRequest(Request.MethodType.POST, "rest/api/content")
    .addHeader("Content-Type", "application/json")
    .setRequestBody(new JsonBuilder(params).toString())
    .execute(new ResponseHandler<Response>() {
    @Override
    void handle(Response response) throws ResponseException {
        if(response.statusCode != HttpURLConnection.HTTP_OK) {
            throw new Exception(response.getResponseBodyAsString())
        }
    }
})