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Showing the stack trace from a running Python application
I have this Python application that gets stuck from time to time and I can't find out where.
28 Answers
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Cannot import XSSF in Apache POI
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For OOXML to work you need the POI-OOXML jar which is separately packaged from the POI jar.
Download the POI-OOXML jar from the following location -
http://repo1.maven.org/maven2/org/apache/poi/poi-ooxml/3.11/poi-ooxml-3.11.jar
For Maven2 add the below dependency -
<dependency>
<gr...
How to analyze a java thread dump?
... explains what that waiting on means:
A lock prevents more than one entity from accessing a shared resource. Each object in Java™ has an associated lock (gained by using a synchronized block or method). In the case of the JVM, threads compete for various resources in the JVM and locks on Java obje...
The communication object, System.ServiceModel.Channels.ServiceChannel, cannot be used for communicat
...tch and handle your server-side errors - do not let .NET exceptions travel from the server to the client - always wrap those into interoperable SOAP faults. Check out the WCF IErrorHandler interface and implement it on the server side
if you're about to send a second message onto your channel from t...
What happens if you call erase() on a map element while iterating from begin to end?
...C++03
Erasing elements in a map does not invalidate any iterators.
(apart from iterators on the element that was deleted)
Actually inserting or deleting does not invalidate any of the iterators:
Also see this answer:
Mark Ransom Technique
But you do need to update your code:
In your code you i...
How to fix Git error: object file is empty?
....com> 1347358589 -0400 commit: fixed up to page 28
Step 7: Note that from Step 6 we learned that the HEAD is currently pointing to the very last commit. So let's try to just look at the parent commit:
nathanvan@nathanvan-N61Jq:~/workspace/mcmc-chapter$ git show 9f0abf890b113a287e10d56b66dbab6...
filename and line number of python script
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Thanks to mcandre, the answer is:
#python3
from inspect import currentframe, getframeinfo
frameinfo = getframeinfo(currentframe())
print(frameinfo.filename, frameinfo.lineno)
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Unlink of file Failed. Should I try again?
...could mean that another program is using the file, which is preventing git from "moving" the file into or out of the working directory when you are attempting to change branches.
I have had this happen on Windows Vista where eclipse is the program "using" the file. The file may not be actually ope...
Interfaces vs. abstract classes [duplicate]
...s. However, they are typically more flexible as a type can only be derived from one class, but can implement any number of interfaces.
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What is the purpose of mock objects?
...e to provide). The mock will indicate whether what really happens differs from what is supposed to happen. A custom mock object could be created from scratch for each test case to execute the expected behavior for that test case, but a mocking framework strives to allow such a behavior specificati...