英文:
I can't serialize a list of tabular java tables using GSON
问题
我使用Tabula（Java）来提取PDF文件中包含的表格。在获得表格列表后，我使用Gson类来实现这个列表。然而，出现了以下异常。
表格提取和序列化
List<Table> tables = new PDFTableExtractor(document).extract(page);
new Gson().toJson(tables);
抛出异常
java.lang.IllegalArgumentException: jdk.internal.ref.PhantomCleanable<?> 声明了多个名为next的JSON字段
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:172)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:102)
at com.google.gson.Gson.getAdapter(Gson.java:458)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:117)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:166)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:102)
at com.google.gson.Gson.getAdapter(Gson.java:458)
我正在使用Tabula库中的Table类。该类包含以下属性：
private final String extractionMethod;
private int rowCount = 0;
private int colCount = 0;
private List<List<RectangularTextContainer>> memoizedRows = null;
/* 对于测试而可见 */ final TreeMap<CellPosition, RectangularTextContainer> cells = new TreeMap<>();
英文:
I use Tabula (java) to extract tables contained in pdf files. After obtaining a list of tables I use the Gson class to realize this list. However, the following exception is thrown.
Table extraction and serelization
List<Table> tables = new PDFTableExtractor(document).extract(page);
new Gson().toJson(tables);
Exception thrown
java.lang.IllegalArgumentException: jdk.internal.ref.PhantomCleanable<?> declares multiple JSON fields named next
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:172)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:102)
at com.google.gson.Gson.getAdapter(Gson.java:458)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:117)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:166)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:102)
at com.google.gson.Gson.getAdapter(Gson.java:458)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:117)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:166)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:102)
at com.google.gson.Gson.getAdapter(Gson.java:458)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:117)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:166)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:102)
at com.google.gson.Gson.getAdapter(Gson.java:458)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:117)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:166)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:102)
at com.google.gson.Gson.getAdapter(Gson.java:458)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:117)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:166)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:102)
at com.google.gson.Gson.getAdapter(Gson.java:458)
I'm using the Table class from the Tabula library. The class contains the following attributes:
private final String extractionMethod;
private int rowCount = 0;
private int colCount = 0;
private List<List<RectangularTextContainer>> memoizedRows = null;
/* visible for testing */ final TreeMap<CellPosition, RectangularTextContainer> cells = new TreeMap<>();
答案1
得分: 0
（tabula-java 的维护者在这里）
该库已经使用 Gson 实现了序列化。请查看 TableSerializer
英文:
(maintainer of tabula-java here)
The library already implements serialization with Gson. Take a look at TableSerializer
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