I’m writing a program that manages a library. This part of the program is where you borrow a book, but only if it’s in the library, so I check if the book is in the library but it always comes back negative even if the string is in the library txt file. What should I do? Answer You are just
sheet.getDataValidations() returns an empty list when a cell is validated by a sequence on another sheet
I have a workbook with two sheets: Sheet1 Sheet2 And there is a sequence on Sheet2 at the range of A1 to A5: aa bb cc dd ee And in Sheet1, the cell A1 is validated by the sequence in Sheet2. Excel screenshot However, sheet.getDataValidations() returns an empty list for this case. Did I miss something? “…
Is there a way of calling an advice method after execution of certain line of code using spring AOP
I have been wring Aspect for logging purpose. Now i am able to use before and after advice. But is it possible to call an advice after execution of certain line of business logic. Here is my current code and i want to substitute my code with advice. How to do that? My Aspect class How can i replace tightly
How to configure proguard to keep all classes in packages that contain a specific word in package name?
I am trying to keep all classes in packages that contain the word model in the package name. Eg – com.xyz.model, com.xyz.abc.model, com.xyz.model.abc All the classes in these packages should not be obfuscated. I tried using wildcard for package names but it isn’t working How to achieve the desired…
Return maximum element
I wrote this program which can count the number of pizzas ordered. I can’t find how to return the maximum element of my list (the pizza with maximum orders). I tried this but it doesn’t work return …
map yaml config to a java hashmap
I have below in my yaml I am map it in my spring bean as follow, I get below error, Cannot convert value of type [java.lang.String] to required type [java.util.Map]: no matching editors or conversion strategy found How can I map a configuration map representation to a java hashmap? Answer In yaml try to forma…
cannot insert list of maps to Apache Cassandra
This is my schema insert query generated by java is in this form issue is with ‘=’ sign in the map objects in the list of maps. How can I insert it correctly? in java. Answer map value should be specified as {key1:val1, key2:val2} (see docs), in your case it should be a but really, you shouldnR…
java – synchronization and volatile variable
I’ve read from this article that: …Synchronized blocks also guarantee that all variables accessed inside the synchronized block will be read in from main memory, and when the thread exits the synchronized block, all updated variables will be flushed back to main memory again, regardless of whether…
SAP DBTech JDBC: Cannot connect to jdbc:sap://… on SCP
I’m running a Java application in the SAP Cloud Platform that connects to a shared HANA database using JDBC. Out of a sudden (no code changes, no deployments, no config changes…) the application can no longer connect to the database. The logs/stacktrace says: Failed to get connection from datasour…
@ResponseBody returns empty object
When I use below to get the user object it works just fine. Above gives me a response back as: Now, I am trying to search based on UUID(4) using this: This doesn’t return anything. No error, no warning whatsoever. While this gives me all the details I need: This is what I have in my Repository and Entit…