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我正在使用selenium webdriver作爲JSP上的應用程序。我添加的任何東西都與硒有關，它會給出錯誤。它只在刪除WebElements時才起作用。任何人有什麼想法我可以做什麼？爲什麼任何try/catch while while循環會導致空指針異常
這裏是我的代碼
while(i < x)
{
i++;
writer.println("\n\n"+"Number "+i +"\n\n");
if(rs.next())
{
WebElement acc = wait.until(ExpectedConditions.elementToBeClickable(By.id("x_account_"+i)));
WebElement desc = driver.findElement(By.id("x_original_"+i));
WebElement inf_desc = driver.findElement(By.id("x_infringement_"+i));
WebElement twt_url = driver.findElement(By.id("x_url_"+i));
List<WebElement> link_in_twt = driver.findElements(By.name("x_target_"+i));
WebElement link_in_twt_1 = driver.findElement(By.id("x_website_direct_"+i));
WebElement link_in_twt_conf = driver.findElement(By.id("x_website_direct_confirm_"+i));
WebElement report_another_twt = driver.findElement(By.id("more_x_link"));
String ACCOUNT = rs.getString("User");
String DESC = "Sound and video recordings as performed by the " +
"artist known as "+rs.getString("artist")+".";
String INF_DESC = "This account is" +
" incorrect.";
String TWT_URL = rs.getString("FB_TW_Link");
//-------------------------------------------------------------------
try
{
acc.sendKeys(ACCOUNT);
String Acc = "Account: "+ ACCOUNT +" - Complete";
writer.println(Acc+"\n");
//output.scrollRectToVisible(null);
Thread.sleep(timer);
}
catch(InterruptedException e)
{
writer.println(e+" ID:14");
}
//-------------------------------------------------------------------
try
{
desc.sendKeys(DESC);
String Desc = "Description: "+DESC+" - Complete";
writer.println(Desc+"\n");
Thread.sleep(timer);
}
catch(InterruptedException e)
{
writer.println(e+" ID:15");
}
//-------------------------------------------------------------------
try
{
inf_desc.sendKeys(INF_DESC);
String Inf_Desc = "Inf_Des: "+INF_DESC+" - Complete";
writer.println(Inf_Desc+"\n");
Thread.sleep(timer);
}
catch(InterruptedException e)
{
writer.println(e+" ID:16");
}
//-------------------------------------------------------------------
try
{
twt_url.sendKeys(TWT_URL);
String Twt_Url= "URL: "+TWT_URL+" - Complete";
writer.println(Twt_Url+"\n");
Thread.sleep(timer);
}
catch(InterruptedException e)
{
writer.println(e+" ID:17");
}
//-------------------------------------------------------------------
try
{
for(WebElement RadioOption : link_in_twt)
{
if(RadioOption.getAttribute("value").equals("website"))
RadioOption.click();
String Link_in_twt = "Radio in URL: Click - Complete";
writer.println(Link_in_twt+"\n");
Thread.sleep(timer);
}
}
catch(InterruptedException e)
{
writer.println(e+" ID:18");
}
//-------------------------------------------------------------------
try
{
link_in_twt_1.click();
String Link_in_twt_1 = "Radio in URL2: Click - Complete";
writer.println(Link_in_twt_1+"\n");
Thread.sleep(timer);
}
catch(InterruptedException e)
{
writer.println(e+" ID:19");
}
//-------------------------------------------------------------------
try
{
link_in_twt_conf.click();
String Link_in_twt_conf = "Radio URL3 Conf: Click - Complete";
writer.println(Link_in_twt_conf+"\n");
Thread.sleep(timer);
}
catch(InterruptedException e)
{
writer.println(e+" ID:20");
}
if(i != x)
{
//try
//{
report_another_twt.click();
writer.println("Report Another: Click - Complete");
// Thread.sleep(3000);
//}
//catch(InterruptedException e)
//{
// writer.println(e + "ID: Report Another x");
//}
}
}
else
{
writer.println("There was an error in the MySQL query! ID:26");
}
}
錯誤
java.lang.NullPointerException
at att.yet.petl.XmlServlet.doGet(XmlServlet.java:492)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
道歉沒有給予足夠的信息
線492
WebElement ack1 = driver.findElement(By.id("claimer"));
protected void doGet(final HttpServletRequest request, final HttpServletResponse response) throws ServletException, IOException {
MysqlConnect();
PrintWriter writer = response.getWriter();
try
{ //note that the entire script is basically in one try/catch
int x =1;
int i = 0;
rs = st.executeQuery(" query is here");
DesiredCapabilities capability = DesiredCapabilities.firefox();
capability.setCapability("platform", Platform.ANY);
capability.setCapability("binary", "/ms/dist/fsf/PROJ/firefox/16.0.0/bin/firefox");
URL url2 = null;
try {
url2 = new URL("http://localhost:4444/wd/hub");
} catch (MalformedURLException e1) {
e1.printStackTrace();
}
WebDriver driver = new RemoteWebDriver(url2,capability);
driver.get("https://site.com");
WebDriverWait wait = new WebDriverWait(driver,10);
int timer = 0;
WebElement numOne = driver.findElement(By.id("owner"));
WebElement numTwo = driver.findElement(By.id("input_text"));
WebElement numThree = driver.findElement(By.id("comp"));
一切都在這之間僅僅是點擊和的SendKeys
呃，格式化你的代碼，並告訴我們你的'XmlServlet＃的doGet（）'方法。 –
並指出哪一行代碼是XmlServlet.java的第492行 –
您可以在您的代碼中添加註釋以向我們展示哪一行是拋出NullPointerException？如果您發佈整個班級代碼，這也可能有所幫助。我懷疑你的WebDriver可能是空的。 –