JavaCallout error "Failed to instantiate the JavaCallout Class apigee.test.TestJavaProject"

Google Cloud Apigee
1

I am using Java Callout policy where i am intending to populate the Java POJO objects using Jackson databinding based on the JSON service callout response.

I have noticed that as soon as i import Jackson ObjectMapper dependency as follows :

import com.fasterxml.jackson.databind.ObjectMapper

I start getting following error while deployment :

The revision is deployed, but traffic cannot flow. Failed to instantiate the JavaCallout Class apigee.test.TestJavaProject

I have added the required jackson dependency jars & the Java code works perfectly fine in Eclipse in standalone mode.

Following are my dependency jars :

3220-jars.png
3220-jars.png267×170 4.11 KB

The ObjectMapper class is part of jackson-databind-2.6.3.jar.

Can you please help me fix this issue ?

2

We are using OPDK. In system.log i am seeing following exception :

Caused by: java.lang.Error: Unresolved compilation problem: 
	The import com.fasterxml cannot be resolved
	at apigee.test.TestJavaProject.<init>(TestJavaProject.java:15) ~[na:na]
	... 38 common frames omitted

But as you can see above all jackson related Jars are added.

3

@Dino, @Mukundha Madhavan, @Floyd Jones Can you please help here ?

4

@Swapnil Raverkar can you pls add all jackson-* dependencies to your TestJavaCallout jar. Alternatively you should consider Resource files. Without this Edge will always fail to resolve jackson classes.

5

@msebai

I tried both ways. Adding Resource files was my first try. You can see the screenshot in the post.

I also tried to add all jackson-* jars into main jar. And then use only the main jar.

Now i am getting this error :

Caused by: java.lang.ClassCastException: apigee.test.TestJavaProject cannot be cast to com.apigee.flow.execution.spi.Execution
	at com.apigee.steps.javacallout.JavaCalloutStepDefinition.createNewInstance(JavaCalloutStepDefinition.java:96) ~[javacallout-1.0.0.jar:na]
	at com.apigee.steps.javacallout.JavaCalloutStepDefinition.newInstance(JavaCalloutStepDefinition.java:67) ~[javacallout-1.0.0.jar:na]
	... 32 common frames omitted
6

Is there any issue with using jackson libraries in Java callout ?

7

@Anil Sagar

Can you please help here?

8

@Swapnil Raverkar this exception suggests your class, TestJavaProject, does not implement com.apigee.flow.execution.spi.Execution. pls check guidelines to execute your Java code through a JavaCallout policy.

9

@msebai

Here is the snippet :

package apigee.test;

import java.io.IOException;
import java.lang.reflect.Method;
import java.util.List;

import com.test.api.claims.pojos.Claim;
import com.test.api.claims.pojos.Claims;
import com.test.api.claims.pojos.Metadata;
import com.test.api.claims.pojos.Page;
import com.apigee.flow.execution.ExecutionContext;
import com.apigee.flow.execution.ExecutionResult;
import com.apigee.flow.execution.spi.Execution;
import com.apigee.flow.message.MessageContext;
import com.fasterxml.jackson.databind.ObjectMapper;

public class TestJavaProject implements Execution {

	@Override
	public ExecutionResult execute(MessageContext messageContext, ExecutionContext arg1) {
		//	String wgsResponse = messageContext.getVariable("WGSCalloutResponse.content");

		// Populate ClaimsSummary object from JSON response
		// Read JSON and populate java objects
		/*ObjectMapper mapper = new ObjectMapper();
		try {
			Claims claimsSummary = ((Claims) mapper.readValue(wgsResponse, Claims.class));
			
		} catch (JsonParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (JsonMappingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}*/
		
		messageContext.setVariable("respString", "Test Response String");
		return ExecutionResult.SUCCESS;
	}
10

I see you’re not using jackson libraries in your code so I’m guesing this is most likely resource file issue. Can you please confirm that both expression-1.0.0.jar & message-flow-1.0.0.jar are not part of your JAR/resource folder. Have a look here too

11

@Swapnil Raverkar is everything working out for you?

12

Hi All

I am getting Exception when when trying to deserialize and object.

{“code”:“ExecutionError”,“message”:“Failed to execute JavaCallout. com/auth0/jwt/internal/com/fasterxml/jackson/databind/ObjectMapper {"errorcode":"steps.javacallout.ExecutionError"}”,“source”:“apigeePolicy”,“sourceName”:“apigeePolicy”}

My Code Snippet is following:-

import com.auth0.jwt.internal.com.fasterxml.jackson.databind.DeserializationFeature;import com.auth0.jwt.internal.com.fasterxml.jackson.databind.ObjectMapper;

System.out.println(““);System.out.println(“Input Base64 Data:: \n” + data);System.out.println(””);byte dataArray = Base64.decodeBase64(data);String s = new String(dataArray);s = s.replace(“\n”, “”).replace(“\”, “”);System.out.println(““);System.out.println(“Data to be signed:: \n” + s);System.out.println(””);String singedData = SigningUtil.signData(s,“11”);ObjectMapper mapper = new ObjectMapper();mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);Response res = mapper.readValue(s, Response.class);

Is it fine to use Object mapper inside Apigee Jar, Above code works fine when run locally on mac.

Regards,

Nishant