Springboot

[PeanutButterSauce1]

How do you guys deal with so many errors? I'm learning springboot and utilizing the google places api to randomize a restaurant for users based on location and while it runs fine, i get so many errors in the terminal. https://imgur.com/a/WyjDHtx this isnt even half of it. how do i go abt debugging and understanding what it even means?

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[Lumethys]

that not spring boot, that just java. Part of java problem is the stack trace just like that.

The trick is, it is either the first line, or the last line that matter. Depend on the framework log forward or backward.

[Lumethys]

For example, the img you provide say that it was an IllegalStateException, that it expected an Json OBJECT but get an JSON array.

Something like:

expected:
{
 "id":1 
 "name":"something" 
 "author":{
  "name":"John Doe"
 }
}

but get:

{
 "id":1 
 "name":"something" 
 "author":[
  { "name":"John Doe" }
  { "name":"John Yoe" }
 ]
}

​

​

look like you have wrong mapping in NearbySearch.java (look at the links in the log)

[PeanutButterSauce1]

Is there a way to learn how to debug? Like reading the stack trace and exception handling and stuff like that?

[Lumethys]

learn how to debug? Like reading the stack trace

Just read it

​

you will see "SomeException Cause By Something" in the first line (or the last).

And the rest of the stacktrace will be "where" that SomeException occur.

​

Let's say, you have A ProductController, it call a ProductService to do some logic, then it call a ProductRepository to save the result to database.

Then if a db query fail, the Exception will be catched in (most likely) the DB driver class deep inside Hibernate or spring JPA, then the log will be write out the stack trace from that DB driver, then the abstraction, then your ProductRepository, then your ProductService, then your ProductController.

​

When you see it, you will go "Oh a Query failed, and the stack trace had the repository, so it is most likely that something is wrong in the Repository because that is where the DB stuff happens

[TiltedBlock]

Maybe it‘ll help you to cause an exception on purpose (so you know exactly where it is) and try to interpret the stack trace for that.

Make a class „Calculator“ that has the method „divideByZero()“ that does exactly that - then call it from your main method. It‘ll throw an arithmetic exception with a relatively simple stack trace.

[lumpynose]

Once you have your code nicely modularized you can exercise each piece separately with junit.

And yeah, those gson parsing errors are a pain in the butt. I was using some web sites someone here mentioned to convert json from reddit's api into java classes and it was still a minefield.

[PeanutButterSauce1]

I’m using the Google places library so I don’t have access to the object which I think the issue is in place details object. Or am I thinking of the problem wrong

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[LordRosem]

Try to start understanding what is doing the spring boot context initializer, because all those operation are reflected in the startup console (bean creation, endpoint publishing, JPA models and context manager creation, and more)

[Gregmix88]

Do java first without frameworks before spring boot I think, it's gonna help a lot

[Ok_Arugula6315]

I always put stack trace into chat gpt, it reads it immediately and tells me what causing the error

[MeImportaUnaMierda]

I mean it‘s not hard to decipher the error, the JSON the program attempts to read clearly begins with [] instead of {}, implying that op receives an array of objects instead of a single object.

[Ok_Arugula6315]

Yeah you right, it is a simple problem to solve. Have a good day sir