这是什么错误，如何防止这种情况？存储桶表达式值不具有可比性，并且未指定比较器 [英] what is this error and how do I prevent this? The bucket expression values are not comparable and no comparator specified

问题描述

我正在使用jasperReports和dynamicReports，我想构建一个交叉表报告。到目前为止，我已经发现当我向rowGroups或columnGroups添加数字列时会发生此错误。这就是我得到的，我不知道为什么，我不知道如何解决这个问题。

Im using jasperReports with dynamicReports and I want to build a crosstab report. so far I have figured out that this error happens when I add columns that are numeric to rowGroups or columnGroups. this is what I get and I don't know why and I don't know how to solve this.

错误是：

The bucket expression values are not comparable and no comparator specified

我的代码是：

    CrosstabValues crosstabValues = report.getCrosstab().getCrosstabValues();
    Collection<CrosstabRowGroupBuilder> rowGroup = generateRowGroup(crosstabValues);
    Collection<CrosstabColumnGroupBuilder> columnGroup = generateColumnGroup(crosstabValues);
    Collection<CrosstabMeasureBuilder> measures = generateMeasures(crosstabValues);

    CrosstabBuilder crosstab = ctab.crosstab();

    for(CrosstabRowGroupBuilder row : rowGroup)
        crosstab.addRowGroup(row);
    for(CrosstabColumnGroupBuilder columnGroupBuilder : columnGroup)
        crosstab.addColumnGroup(columnGroupBuilder);
    for(CrosstabMeasureBuilder measure : measures)
        crosstab.addMeasure(measure);

    crosstab.headerCell(cmp.text(crosstabValues.getHeader())
    .setStyle(getCrosstabHeaderCellStyle(report.getTemplate().getReportTemplateValues())));

推荐答案

问题是我给这个方法的课程：

the problem was the class I was giving to this method:

CrosstabRowGroupBuilder cTabRow = ctab.rowGroup(column.getName()
, getColumnTypeClass(column));

我使用Number类来表示所有数字数据。有趣的是它适用于度量但它不适​​用于rowGroup或columnGroup。这就是为什么我感到困惑。

i was using Number class for all numeric data. the funny thing is that it worked for measures but it did not work for rowGroup or columnGroup. that is why I got confused.

现在使用Integer.Class或Long.Class它运作良好。

now with Integer.Class or Long.Class it works good.

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