Fixing errors in Android Java applications

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Stephen Gilmore

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Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Java problems

Common Java problems: raw types

CS/SE Individual Practical
2 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Java problems

Quick ﬁx: a bad suggestion

CS/SE Individual Practical
3 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Java problems

Check the constructor documentation

CS/SE Individual Practical
4 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Java problems

Check the class documentation

CS/SE Individual Practical
5 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Java problems

What type of array are we adapting?

CS/SE Individual Practical
6 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Java problems

Type parameter added

CS/SE Individual Practical
7 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

Raw type in method header

CS/SE Individual Practical
8 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

Consult the Java documentation

CS/SE Individual Practical
9 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

Adapter doesn’t work here

CS/SE Individual Practical
10 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

Adapter is an interface

CS/SE Individual Practical
11 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

T is not a class

CS/SE Individual Practical
12 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

Object: the goto class

CS/SE Individual Practical
13 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

T extends Adapter doesn’t work

CS/SE Individual Practical
14 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

“?” — the wild card parameter

CS/SE Individual Practical
15 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

“Quick ﬁx” would have worked here

CS/SE Individual Practical
16 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Raw type parameters

Same result

CS/SE Individual Practical
17 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Working with the Java compiler

Setting Java compiler preferences

CS/SE Individual Practical
18 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Working with the Java compiler

Changing defaults

CS/SE Individual Practical
19 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Working with the Java compiler

Potential programming problems

CS/SE Individual Practical
20 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Working with the Java compiler

Tighter checking

CS/SE Individual Practical
21 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Working with the Java compiler

Bug found

CS/SE Individual Practical
22 / 24

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Logging

Don’t forget to add logging . . .

CS/SE Individual Practical
23 / 24
.41.02.png

Java problems Raw type parameters Working with the Java compiler Logging Static analysis
Static analysis

Deeper analysis (resource leaks . . . )

CS/SE Individual Practical
24 / 24

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Fixing errors in Android Java applications

1. Java problems Raw type parameters Working with the Java compiler Logging Static analysis CS/SE Individual Practical Stephen Gilmore November 11, 2011 School of Informatics, University of Edinburgh CS/SE Individual Practical 1 / 24

2. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Java problems Common Java problems: raw types CS/SE Individual Practical 2 / 24

3. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Java problems Quick ﬁx: a bad suggestion CS/SE Individual Practical 3 / 24

4. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Java problems Check the constructor documentation CS/SE Individual Practical 4 / 24

5. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Java problems Check the class documentation CS/SE Individual Practical 5 / 24

6. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Java problems What type of array are we adapting? CS/SE Individual Practical 6 / 24

7. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Java problems Type parameter added CS/SE Individual Practical 7 / 24

8. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Raw type parameters Raw type in method header CS/SE Individual Practical 8 / 24

9. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Raw type parameters Consult the Java documentation CS/SE Individual Practical 9 / 24

10. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Raw type parameters Adapter doesn’t work here CS/SE Individual Practical 10 / 24

11. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Raw type parameters Adapter is an interface CS/SE Individual Practical 11 / 24

12. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Raw type parameters T is not a class CS/SE Individual Practical 12 / 24

13. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Raw type parameters Object: the goto class CS/SE Individual Practical 13 / 24

14. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Raw type parameters T extends Adapter doesn’t work CS/SE Individual Practical 14 / 24

15. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Raw type parameters “?” — the wild card parameter CS/SE Individual Practical 15 / 24

16. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Raw type parameters “Quick ﬁx” would have worked here CS/SE Individual Practical 16 / 24

17. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Raw type parameters Same result CS/SE Individual Practical 17 / 24

18. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Working with the Java compiler Setting Java compiler preferences CS/SE Individual Practical 18 / 24

19. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Working with the Java compiler Changing defaults CS/SE Individual Practical 19 / 24

20. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Working with the Java compiler Potential programming problems CS/SE Individual Practical 20 / 24

21. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Working with the Java compiler Tighter checking CS/SE Individual Practical 21 / 24

22. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Working with the Java compiler Bug found CS/SE Individual Practical 22 / 24

23. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Logging Don’t forget to add logging . . . CS/SE Individual Practical 23 / 24 .41.02.png

24. Java problems Raw type parameters Working with the Java compiler Logging Static analysis Static analysis Deeper analysis (resource leaks . . . ) CS/SE Individual Practical 24 / 24

Fixing errors in Android Java applications

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Fixing errors in Android Java applications