我有一个从程序中编译的可执行jar文件,并在PC上运行了该文件。当我使用java -jar [nameofjar.jar]
但是,我尝试在另一台PC上进行测试。使用命令提示符运行相同的jar文件,会引发错误:
D:\QA06122018_2>java -jar Indexing.jar
java.lang.NullPointerException
at IndexDriver.processText(IndexDriver.java:81)
at IndexDriver.index(IndexDriver.java:140)
at Main.main(Main.java:44).....
两台PC都使用相同的操作系统和设置。 我什至查看了有关该错误的代码,似乎没有任何问题。在我的IDE上运行良好。
有什么我可能会忽略的东西吗?
编辑:
代码:
public PreparedStatement preparedStatement = null;
MysqlAccessIndex con = new MysqlAccessIndex();
public Connection con1 = con.connect();
String path1;
public void index() throws Exception {
// Connection con1 = con.connect();
try {
Statement statement = con1.createStatement();
ResultSet rs = statement.executeQuery("select * from filequeue where Status='Active' LIMIT 5");
while (rs.next()) {
// get the filepath of the PDF document
path1 = rs.getString(2);
int getNum = rs.getInt(1);
Statement test = con1.createStatement();
test.executeUpdate("update filequeue SET STATUS ='Processing' where UniqueID="+getNum);
try {
// call the index function
PDDocument document = PDDocument.load(new File(path1),MemoryUsageSetting.setupTempFileOnly());
if (!document.isEncrypted()) {
PDFTextStripper tStripper = new PDFTextStripper();
for(int p=1; p<=document.getNumberOfPages();++p) {
tStripper.setStartPage(p);
tStripper.setEndPage(p);
try {
String pdfFileInText = tStripper.getText(document);
processText(pdfFileInText);
System.out.println("Page "+p+" done");
}catch (Exception e){
e.printStackTrace();
Statement statement1 = con1.createStatement();
statement1.executeUpdate("update filequeue SET Error ='E0003' where UniqueID="+getNum);
statement1.executeUpdate("update filequeue SET Status ='Error' where UniqueID="+getNum);
con1.commit();
con1.close();
}
}
}
// After completing the process, update status: Complete
Statement pre= con1.createStatement();
pre.executeUpdate("update filequeue SET STATUS ='Complete' where UniqueID="+getNum);
// con1.commit();
preparedStatement.close();
document.close();
System.out.println("Successfully commited changes to the database!");
con1.commit();
// con1.close();
// updateComplete_DB(getNum);
} catch (Exception e) {
try {
System.err.println(e);
Statement statement1 = con1.createStatement();
statement1.executeUpdate("update filequeue SET STATUS ='Error' where UniqueID="+getNum);
statement1.executeUpdate("update filequeue SET Error ='E0002' where UniqueID="+getNum);
con1.commit();
// add rollback function
rollbackEntries();
}catch (Exception e1){
System.out.println("Could not rollback updates :" + e1.getMessage());
}
}
// con1.close();
}
}catch(Exception e){
e.printStackTrace();
//System.out.println("lalala");
}
//con1.commit();
con1.close();
}
调用方法:
public void processText(String text) throws SQLException {
String lines[] = text.split("\\r?\\n");
for (String line : lines) {
String[] words = line.split(" ");
String sql="insert IGNORE into test.indextable values (?,?);";
preparedStatement = con1.prepareStatement(sql);
int i=0;
for (String word : words) {
// check if one or more special characters at end of string then remove OR
// check special characters in beginning of the string then remove
// insert every word directly to table db
word=word.replaceAll("([\\W]+$)|(^[\\W]+)", "");
preparedStatement.setString(1, path1);
preparedStatement.setString(2, word);
preparedStatement.executeUpdate();
}
}
preparedStatement.close();
}
答案 0 :(得分:2)
根本原因是没有行要处理。
您似乎只在for (String line : lines) {
循环内创建准备好的语句。但是,您只关闭了最后创建的语句(在循环之外)。
没有任何行时,preparedStatement
为空,因为您从未创建过行。
即使有要处理的行,也要创建很多准备好的语句,但是只会关闭最后一条。
您可能应该在方法的开头创建一个准备好的语句,并在整个方法中重用它,最后将其关闭。