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What is a stack trace, and how can I use it to debug my application errors?
... multiple "Caused by" sections. For these, you typically want to find the "root cause", which will be one of the lowest "Caused by" sections in the stack trace. In our case, it's:
Caused by: java.lang.NullPointerException <-- root cause
at com.example.myproject.Book.getId(Book.java:22) &...
Add context path to Spring Boot application
I am trying to set a Spring Boot applications context root programmatically. The reason for the context root is we want the app to be accessed from localhost:port/{app_name} and have all the controller paths append to it.
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What is the difference between Class.getResource() and ClassLoader.getResource()?
...ive to the .class file while the latter searches relative to the classpath root.
To debug issues like that, I print the URL:
System.out.println( getClass().getResource(getClass().getSimpleName() + ".class") );
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Why is SELECT * considered harmful?
...tage of using * is that in some situations it can take better advantage of MySQL's cache systems. If you're running large numbers of similar select queries that request different column names (select A where X,select B where X,...) using a select * where X will allow the cache to handle a larger num...
Easiest way to copy a single file from host to Vagrant guest?
...tu/trusty64:/usr/share/nginx/html I am trying to copy files into the nginx root directory. It says, The machine with the name 'C' was not found configured for this Vagrant environment. The directory and everything is fine.
– Koushik Das
Sep 23 '16 at 6:08
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Capturing mobile phone traffic on Wireshark
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Here are some suggestions:
For Android phones, any network: Root your phone, then install tcpdump on it. This app is a tcpdump wrapper that will install tcpdump and enable you to start captures using a GUI. Tip: You will need to make sure you supply the right interface name for the ca...
Get Image Height and Width as integer values?
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Chmod image dir to 755
Also try to prefix path with $_SERVER["DOCUMENT_ROOT"], this helps sometimes when you are not able to read files.
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SQL select join: is it possible to prefix all columns as 'prefix.*'?
...iginal" names.
Maybe not the best solution but it works for me....i'm use mysql
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Creating functions in a loop
...Use a function factory to capture the current value of i in a closure
The root of your problem is that i is a variable that can change. We can work around this problem by creating another variable that is guaranteed to never change - and the easiest way to do this is a closure:
def f_factory(i):
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Initializing a list to a known number of elements in Python [duplicate]
... Yes, that's exactly the point. "Premature optimization is the root of all evil" just means that you should write code without caring about performance - at first. If you find that the code is running slow later on, then go back and make optimizations like this one.
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