How do you compile .java back into .class

Question

> javac ChartData1.java
ChartData1.java:51: error: class ChartData is public, should be declared in a file named ChartData.java
public class ChartData                                                                                 
       ^                                                                                               
ChartData1.java:9: error: package com.atlassian.core.util does not exist                               
import com.atlassian.core.util.DateUtils;

I'm already running the above in a java environment. Maybe the maven package needed to be loaded as well somehow ?

fwoon · Answer

Hi Kurt,

This ChartData.java is the same ChartData.class that comes bundled with confluence.6.8.1 as chart-plugin.3.0.1.jar. I would love to attach it here but it's 600+ lines of code so....

Just abit of context :

I managed to decompile the original ChartData.class as ChartData.java...and tried to re-compile it back using the exact ChartData.java but failed. Subsequently i fixed all the errors due to generic.

Then i ran the javac command a level above chart-plugin-3.0.1.mod:

> javac -g -verbose -cp lib/atlassian-core-5.0.9.jar:lib/dom4j-1.6.1.jar:lib/joda-time-2.9.4.jar:lib/jfreechart-1.0.0.jar:lib/nekohtml-1.9.21.jar:lib/commons-lang-2.6.jar:lib/confluence-5.10.8.jar:lib/log4j-1.2.17.jar:lib/jcommon-1.0.0.jar:lib/xercesImpl-2.11.0-atlassian-01.jar chart-plugin-3.0.1.mod/com/atlassian/confluence/extra/chart/ChartData

Right now i am left with the last 2 errors due to the usage of ChartUtil.isVersion103Capable(). ChartUtil.java (which is also decompiled from ChartUtil.class) is in the same folder as ChartData in chart-plugin-3.0.1.mod/com/atlassian/confluence/extra/chart

chart-plugin-3.0.1.mod/com/atlassian/confluence/extra/chart/ChartData.java:404: error: cannot find symbol                                                  
                if (ChartUtil.isVersion103Capable()){
  symbol:   variable ChartUtil location: class ChartData
[loading ZipFileIndexFileObject[lib/jfreechart-1.0.0.jar(org/jfree/data/gantt/GanttCategoryDataset.class)]]                                                
[loading ZipFileIndexFileObject[lib/jfreechart-1.0.0.jar(org/jfree/data/category/IntervalCategoryDataset.class)]]                                          
chart-plugin-3.0.1.mod/com/atlassian/confluence/extra/chart/ChartData.java:405: error: cannot find symbol
                    taskSeries = collection3.getSeries(category2);                             
  symbol:   method getSeries(String)
  location: variable collection3 of type TaskSeriesCollection

I am starting to wonder if running javac is not the way to do this and instead create a confluence plugin via atlas-create plugin and try to somehow mimic all the file structure..since atlas-mvn package seems to convert all the .java to .class and package it into a jar file. However i tried that as well but ended up with like 22 errors that needs to be addressed.

It's hard to try to fix a atlassian error with just the .jar file w/o the actual project files

Kurt Klinner · Answer

@fwoon

Hi Francis,

without the source code it is quite hard to see why the incompatible types are mentioned. Could you share the source code?

Cheers

Kurt

fwoon · Answer

Hi Kurt,

I managed to get it to work but got 13 errors.Seems like it needs to be run via atlas-mvn package ?

I was thinking do i really need to actually go thru atlas-create-confluence-plugin to create the plugin, put everything in and try to make it work so that atlas-mvn package works to package it into the jar that contains all the compiled .class ?

javac -g -cp lib/atlassian-core-5.0.9.jar:lib/dom4j-1.6.1.jar:lib/joda-time-2.9.4.jar:lib/jfreechart-1.0.0.jar:lib/nekohtml-1.9.21.jar:lib/commons-lang-2.6.jar:lib/confluence-5.10.8.jar:lib/log4j-1.2.17.jar:lib/jcommon-1.0.0.jar:lib/xercesImpl-2.11.0-atlassian-01.jar ChartData.java
ChartData.java:146: error: incompatible types: Object cannot be converted to DateFormat
return this.dateFormats.get(index);
^
ChartData.java:229: error: incompatible types: Object cannot be converted to Element
final Element element = iterator.next();
^
ChartData.java:262: error: incompatible types: Object cannot be converted to Element
for (final Element e : element.elements()) {
^
ChartData.java:393: error: incompatible types: Object cannot be converted to Element
category2 = this.getFullText(this.headerList.get(0));
^
ChartData.java:397: error: cannot find symbol
if (ChartUtil.isVersion103Capable()) {
^
symbol: variable ChartUtil
location: class ChartData
ChartData.java:398: error: cannot find symbol
taskSeries = collection3.getSeries(category2);
^
symbol: method getSeries(String)
location: variable collection3 of type TaskSeriesCollection
ChartData.java:472: error: incompatible types: Object cannot be converted to Node
final Node node = i.next();
^
ChartData.java:491: error: cannot find symbol
return iterator.next().parse(value);
^
symbol: method parse(String)
location: class Object
ChartData.java:521: error: cannot find symbol
final Date date = iterator.next().parse(value);
^
symbol: method parse(String)
location: class Object
ChartData.java:559: error: cannot find symbol
final Attribute attribute = this.headerList.get(i).attribute(“title”);
^
symbol: method attribute(String)
location: class Object
ChartData.java:561: error: incompatible types: Object cannot be converted to Element
final String value = this.getFullText(this.headerList.get(i));
^
ChartData.java:596: error: incompatible types: Object cannot be converted to Element
final String elementText = ChartData.this.getFullText(this.list.get(i));
^
ChartData.java:603: error: incompatible types: Object cannot be converted to Element
final String elementText2 = ChartData.this.getFullText(this.list.get(i));
^
Note: ChartData.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
13 errors