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Problem exported type <type> should have comment or be unexported Solution The type should have a comment in the form:

While trying to deploy a Spring application: Problem: heroku[router]: at=error code=H10 desc="App crashed" (...) Solution: Create a `Procfile` under the project root with the contents: web: java -Dserver.port=$PORT $JAVA_OPTS -cp target/classes:target/dependency/* <path to main class> The problem is that the application is not binding with the Heroku provided port.

Problem: com.sksamuel.elastic4s.TcpClient$ - No cluster.name was specified in the settings for the client." Solution: Add the cluster name as a parameter on the connection URI: Go to http://<elasticsearch_host>:9200 Retrieve the cluster_name value and add it as a parameter to the connection URI: elasticsearch://<elasticsearch_host>:9300?cluster.name=<cluster_name_value

Problem: Starting problems while using the apollo graphQL client: $ npm install apollo-client apollo-angular graphql-tag --save (...) $ npm start   (...) ERROR in /(...)/node_modules/apollo-client/core/types.d.ts (17,45): ',' expected. ERROR in /(...)/node_modules/apollo-client/core/types.d.ts (17,47): '>' expected. ERROR in /(...)/node_modules/apollo-client/core/types.d.ts (19,2): ';' expected. ERROR in /(...)/node_modules/apollo-client/core/types.d.ts (19,4): Expression expected. ERROR in /(...)/node_modules/apollo-client/core/types.d.ts (20,10): Expression expected. ERROR in /(...)/node_modules/apollo-client/core/types.d.ts (20,5): Cannot find name 'data'. ERROR in /(...)/node_modules/apollo-client/core/types.d.ts (20,12): Cannot find name 'T'. ERROR in /(...)/node_modules/apollo-client/data/mutationResults.d.ts (8,48): ',' expected. ERROR in /(...)/node_modules/apollo-client/data/mutationResults.d.ts (8,50): '>...

Problem: Adding apollo GraphQL client to a Angular 4 application: $ npm install apollo-client apollo-angular graphql-tag --save UNMET PEER DEPENDENCY apollo-client@1.9.0-0 Solution: Update npm version $ npm install -g npm

Problem: javax.xml.transform.TransformerConfigurationException: Error checking type of the expression 'funcall(replace, Solution: Make sure to be using an updated xsl transalation engine like, for instance, saxon 9. Maven dependency: <dependency> <groupId>net.sf.saxon</groupId> <artifactId>Saxon-HE</artifactId> <version>9.8.0-3</version> </dependency> Usage example: XMLToCSVStyle.xsl