Using decision within a java delegate - camunda

Question

I am trying to evaluate a decision inside a camunda java delegate that I created. Following is the code that I am using. Upon executing the delegate( which runs fine without the DMN part), I get an error stating:
java.lang.NoClassDefFoundError: de/odysseus/el/util/SimpleContext"
I am using gradle and have added the following to my .build :
compile 'org.camunda.bpm.dmn:camunda-engine-dmn' ,
'org.camunda.bpm.dmn:camunda-engine-feel-juel:7.5.0-alpha2' ,
'de.odysseus.juel:juel-spi:2.2.7',
'de.odysseus.juel:juel-api:2.2.7' ,
'de.odysseus.juel:juel-impl:2.2.7'
Any suggestion how can I fix this error up? Thanks.
DMN Code:
DmnEngine dmnEngine = DmnEngineConfiguration.createDefaultDmnEngineConfiguration().buildEngine();
// read the DMN XML file as input stream
InputStream inputStream = CheckDatafileExistsExecutor.class.getResourceAsStream("decision1.xml");
// parse the DMN decision from the input stream
DmnDecision decision = dmnEngine.parseDecision("Decision_13nychf", inputStream);
//accessing the input variables
VariableMap variables = Variables.fromMap((Map<String, Object>) decision);
// evaluate the decision table with the input variables
DmnDecisionTableResult result = dmnEngine.evaluateDecisionTable(decision, variables);
int size = result.size();
DmnDecisionRuleResult ruleResult = result.get(0);

Answer 1

Remove all your dependencies and add only compile group: 'org.camunda.bpm.dmn', name: 'camunda-engine-dmn', version: '7.6.0'
You can try also menskis example, but change the camunda-engine-dmn to 7.6.0
and
DmnDecisionTableResult results = dmnEngine.evaluateDecisionTable("decision", "Example.dmn", variables);
to
InputStream fileAsStream = IoUtil.fileAsStream("Example.dmn");
DmnDecisionTableResult results = dmnEngine.evaluateDecisionTable("decision", fileAsStream, variables);

Answer 2

You can use delegate service for decision evaluation based on key or Id,
eg:-
public void execute(DelegateExecution delegateExecution) throws Exception{
DecisionService decisionService = delegateExecution.getProcessEngineServices().getDecisionService();
decisionService.evaluateDecisionByKey(dmnToInvoke).variables(delegateExecution.get Variables()).evaluate();
}