I’m new to Spring and largely to Java beyond the language itself…minimal console apps, etc. I’m trying to get the Spring website example here (https://spring.io/guides/gs/serving-web-content/) to work and I’m trying to stick with the spring boot piece used in the example rather than ba…
Tag: java
Java collection like c# KeyedColllection
Is there a Java collection that has the same behavior as the c# abstract KeyedCollection class (that is items can be retrieved by both key and index)? I have looked around but can’t find anything similar. Thanks, Nick Answer I think you can develop Your own class by extending a HashMap
How do you use anonymous objects with the factory pattern?
I have a method as so: Now if I do this: It’ll work perfectly fine. However, if I try to do this : It doesn’t seem to work at all. It says “variable expected”. I understand that new Foo() in itself, creates a new Foo object, but even if I use the factory, it should just override the an…
Java array manipulation, invert an int[][] array
I am trying to flip each col in this array to invert the image. However, when I run my code, I get a mirror image of the second half of the image, for some ridiculous reason, that I cannot figure out. Can someone please tell me why this only works half-way? someArray is an int[][] array defined elsewhere in m…
Check how many people are within a certain distance from the center
I’m making a Spleef plugin. I need to count the amount of people in a lobby. I thought that I could count how many people are within a certain distance from the center of the lobby. I think that this may work better than recording when someone types the command. Main.java: playerJoinedGame.java: I have …
Id of entity is different after hibernate save from oracle database with sequence autogeneration id
Entity with id autogenerated from oracle trigger sequence. Service DAO And When I call service’s saveOrUpdate and then try to reach id of entity I get different value than persisted in database. Values on database with autogeneration all is ok. Any suggestions? prints: 4150 but saved id in database is: …
java mail as pdf files as attachment
I am trying to send an e-mail with a PDF as an attachment. It was including the file but its size was less than what it was on disk, and when trying to open it, it says the file is corrupted. Answer Doing some research i found another topic about sending mail with pdf attachment here. He does it by
Possibility of passing MyObject to bean routing using Apache camel?
I am consuming messages from Apache kafka using apache camel JAVA DSLs. I am writing an object by converting it to byte[] on kafka. when I consume it I receive a message back with byte[]. I deserialize it and get an object. I checks it if it is an object of MyObject then need to pass it to bean using
Resolve DBRef into Json
I’m getting the following error in a Normalized Data Model structure in MongoDB: It’s caused by this line: Specifically the toJson() part. I have a DBRef Object in my Document, so I can reference a Document from another Collection. An Embedded Document Structure is not option. So how can I fix thi…
how to send a html email with attached file using JavaMail
The following Java code is used to attach a file to a html email and send it. I want to send attachment with this html email. Any suggestions would be appreciated. This brings me just only the attachment . But i want to send html email with this attachment . Answer Creating a mail with an HTML body and an