For loop For循环导致java.lang.NullPointerException
我正在开发一个Java应用程序。当我尝试运行某个任务时，它会导致java.lang.NullPointerException。以下是错误：For loop For循环导致java.lang.NullPointerException,for-loop,nullpointerexception,For Loop,Nullpointerexception,我正在开发一个Java应用程序。当我尝试运行某个任务时，它会导致java.lang.NullPointerException。以下是错误： java.lang.NullPointerException at com.greenapple.program.core.TesterScript.buildStudentFileset(TesterScript.java:120) at com.greenapple.program.core.TesterScript$1.run(TesterScript
java.lang.NullPointerException
at com.greenapple.program.core.TesterScript.buildStudentFileset(TesterScript.java:120)
at com.greenapple.program.core.TesterScript$1.run(TesterScript.java:83)
public Set<StudentFiles> buildStudentFileset(String foo) {
Set<StudentFiles> set = new HashSet<StudentFiles>();
File[] studentFolders = new File(foo).listFiles(DirectoryFileFilter.instance().asFileFilter());
for (int i = 0; i < studentFolders.length; i++) {
set.add(new StudentFiles(studentFolders[i]));
}
return set;
}
package com.greenapple.program.core;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.atomic.AtomicReference;
@Immutable
public class TesterScript implements Testable {
private final String name;
private final String resultsFile;
private final String studentFolder, tester, testerName;
private final String addDep;
private final int millisPerTest, millisTotal;
private final UUID id;
private Thread thread = null;
public TesterScript(String scriptName, String folderOfStudentFolders, String testerPath, String testerBinaryName, String addDeps, int maxMillisPerTest, int maxMillisTotal, UUID ID, String writeResultsTo) {
name = scriptName;
resultsFile = writeResultsTo;
id = ID;
studentFolder = folderOfStudentFolders;
tester = testerPath;
testerName = testerBinaryName;
addDep = addDeps;
millisPerTest = maxMillisPerTest;
millisTotal = maxMillisTotal;
}
public synchronized void test(Map<String, String> replace, final OneArgumentFunctor<Void, Progress> progressFunct, final TwoArgumentFunctor<Void, Testable, TesterResults> finishedFunct) {
if (thread != null)
return;
final String resultsFile = doReplacement(this.resultsFile, replace);
final String studentFolder = doReplacement(this.studentFolder, replace);
final String tester = doReplacement(this.tester, replace);
final String addDep = doReplacement(this.addDep, replace);
final AtomicReference<TesterResults> res = new AtomicReference<TesterResults>();
thread = new Thread() {
Object fooLock = new Object();
TesterTask task = null;
ProgressTesterTaskRunner runner = null;
public void run() {
synchronized (fooLock) {
if (progressFunct != null)
progressFunct.invoke(new Progress("building task", 0, 1));
task = new TesterTask(buildStudentFileset("studentFolder"), new File(tester), testerName, addDep, name, millisPerTest, millisTotal);
runner = new ProgressTesterTaskRunner(task, progressFunct);
}
runner.compile();
runner.run();
res.set(runner.getResults());
}
public void interrupt() {
synchronized (fooLock) {
if (runner != null)
runner.stop();
}
}
};
thread.start();
while (thread.isAlive()) {
try {
thread.join();
} catch (InterruptedException ex) {
thread.interrupt();
continue;
}
}
if (res.get() != null)
res.get().writeResultsToFile(new File(resultsFile), 3, true);
ExecuteAfterThisThreadThread after = new ExecuteAfterThisThreadThread(Thread.currentThread(), new ZeroArgumentFunctor<Void>() {
public Void invoke() {
finishedFunct.invoke(TesterScript.this, res.get());
return null;
}
});
thread = null;
after.start();
}
public Set<StudentFiles> buildStudentFileset(String foo) {
Set<StudentFiles> set = new HashSet<StudentFiles>();
File[] studentFolders = new File(foo).listFiles(DirectoryFileFilter.instance().asFileFilter());
for (int i = 0; i < studentFolders.length; i++) {
set.add(new StudentFiles(studentFolders[i]));
}
return set;
}
private Set<File> buildAddDepFileset(Set<String> foo) {
return new HashSet<File>();
}
public UUID id() {
return id;
}
public String name() {
return name;
}
public void write(String filename) {
write(new File(filename));
}
private void write(File file) {
if (file.exists() && !file.isFile())
throw new IllegalArgumentException("not a regular file: "+file);
if (file.exists() && !FileUtils.isEmpty(file)) {
new File(file.getPath()+".old").delete();
file.renameTo(new File(file.getPath()+".old"));
file.delete();
}
final String NEWLINE = "\n";
try {
FileWriter w = new FileWriter(file);
w.write("JTTNG-Script/1.0"+NEWLINE);
w.write("Script-ID: "+id().toString()+NEWLINE);
w.write("Script-Name: "+name()+NEWLINE);
w.write("Folder-of-Student-Folders: "+folderOfStudentFolders()+NEWLINE);
w.write("Tester-Path: "+testerFile()+NEWLINE);
w.write("Tester-Binary-Name: "+testerBinaryName()+NEWLINE);
w.write("Additional-Dependencies-Length: "+"1"+NEWLINE);
w.write("Additional-Dependencies: "+addDep+NEWLINE);
w.write("Results-Path: "+resultsFile+NEWLINE);
w.write("Per-Test-Timeout: "+millisPerTest+NEWLINE);
w.write("Total-Timeout: "+millisTotal+NEWLINE);
w.close();
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
public boolean hasSubtests() {
return false;
}
public List<Testable> subtests() {
return Collections.emptyList();
}
public synchronized void stop() {
if (thread != null && thread.isAlive())
thread.interrupt();
}
public String resultFile() {
return resultsFile;
}
public String folderOfStudentFolders() {
return studentFolder;
}
public String testerFile() {
return tester;
}
public String testerBinaryName() {
return testerName;
}
public String additionalDependencies() {
return addDep;
}
public int millisPerTest() {
return millisPerTest;
}
public int millisTotal() {
return millisTotal;
}
@Override
public boolean equals(Object o) {
if (!(o instanceof TesterScript))
return false;
return id().equals(((TesterScript)o).id());
}
@Override
public int hashCode() {
return id().hashCode();
}
@Override
public String toString() {
return name();
}
@Override
public TesterScript clone() {
return new TesterScript(name(), folderOfStudentFolders(), testerFile(), testerBinaryName(), additionalDependencies(), millisPerTest(), millisTotal(), id(), resultFile());
}
private String doReplacement(String foo, Map<String, String> replace) {
for (Map.Entry<String, String> e : replace.entrySet())
foo = foo.replace(e.getKey(), e.getValue());
return foo;
}
public boolean canWriteResults(Map<String, String> replace) {
FileOutputStream os = null;
boolean retval = true;
try {
os = new FileOutputStream(doReplacement(resultFile(), replace));
} catch (IOException e) {
e.printStackTrace();
retval = false;
} finally {
if (os != null)
try {
os.close();
} catch (IOException ex) {}
}
return retval;
}
}
package com.greenapple.program.core；
导入java.io.File；
导入java.io.FileOutputStream；
导入java.io.FileWriter；
导入java.io.IOException；
导入java.util.Collections；
导入java.util.HashSet；
导入java.util.List；
导入java.util.Map；
导入java.util.Set；
导入java.util.UUID；
导入java.util.concurrent.AtomicReference；
@不变的
公共类TesterScript实现了可测试的{
私有最终字符串名；
私有最终字符串结果文件；
私有最终字符串学生文件夹、测试员、测试员名称；
私有最终字符串addDep；
私人最终int millisPerTest，millisTotal；
专用最终UUID id；
私有线程线程=null；
公共TesterScript（字符串脚本名、字符串文件夹文件夹、字符串测试路径、字符串测试路径、字符串测试路径、字符串addDeps、int-maxMillisPerTest、int-maxMillisTotal、UUID ID、字符串writeResultsTo）{
名称=脚本名称；
resultsFile=writeResultsTo；
id=id；
学生文件夹=学生文件夹的文件夹；
tester=testerPath；
testerName=testerBinaryName；
addDep=addDeps；
millisPerTest=最大millisPerTest；
millisTotal=maxMillisTotal；
}
公共同步无效测试（映射替换、最终一个ArgumentFunctor progressFunct、最终两个ArgumentFunctor finishedFunct）{
if（线程！=null）
返回；
最终字符串resultsFile=doReplacement（this.resultsFile，replace）；
最终字符串studentFolder=doReplacement（this.studentFolder，replace）；
最终管柱测试器=D更换（此测试器，更换）；
最终字符串addDep=doReplacement（this.addDep，replace）；
最终原子引用res=新原子引用（）；
线程=新线程（）{
Object-whoolock=新对象（）；
TesterTask任务=null；
ProgressTesterTaskRunner=null；
公开募捐{
同步（傻瓜）{
如果（progressFunct！=null）
调用（新进度（“构建任务”，0，1））；
任务=新测试任务（buildStudentFileset（“studentFolder”）、新文件（tester）、testerName、addDep、name、millisPerTest、millisTotal）；
runner=新的ProgressTesterTaskRunner（任务，progressFunct）；
}
runner.compile（）；
runner.run（）；
res.set（runner.getResults（））；
}
公共空间中断（）{
同步（傻瓜）{
if（runner！=null）
停止（）；
}
}
};
thread.start（）；
while（thread.isAlive（））{
试一试{
thread.join（）；
}捕获（中断异常例外）{
thread.interrupt（）；
继续；
}
}
如果（res.get（）！=null）
res.get（）.writeResultsToFile（新文件（结果文件），3，true）；
ExecuteAftherThisThreadThread after=新的ExecuteAftherThisThreadThread（Thread.currentThread（），new ZeroArgumentFunctor（））{
公共无效调用（）{
finishedFunct.invoke（TesterScript.this，res.get（））；
返回null；
}
});
线程=null；
在.start（）之后；
}
公共集buildStudentFileset（字符串foo）{
Set=newhashset（）；
File[]studentFolders=新文件（foo）.listFiles（DirectoryFileFilter.instance（）.asFileFilter（））；
对于（int i=0；ipackage com.greenapple.program.core;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.atomic.AtomicReference;
@Immutable
public class TesterScript implements Testable {
private final String name;
private final String resultsFile;
private final String studentFolder, tester, testerName;
private final String addDep;
private final int millisPerTest, millisTotal;
private final UUID id;
private Thread thread = null;
public TesterScript(String scriptName, String folderOfStudentFolders, String testerPath, String testerBinaryName, String addDeps, int maxMillisPerTest, int maxMillisTotal, UUID ID, String writeResultsTo) {
name = scriptName;
resultsFile = writeResultsTo;
id = ID;
studentFolder = folderOfStudentFolders;
tester = testerPath;
testerName = testerBinaryName;
addDep = addDeps;
millisPerTest = maxMillisPerTest;
millisTotal = maxMillisTotal;
}
public synchronized void test(Map<String, String> replace, final OneArgumentFunctor<Void, Progress> progressFunct, final TwoArgumentFunctor<Void, Testable, TesterResults> finishedFunct) {
if (thread != null)
return;
final String resultsFile = doReplacement(this.resultsFile, replace);
final String studentFolder = doReplacement(this.studentFolder, replace);
final String tester = doReplacement(this.tester, replace);
final String addDep = doReplacement(this.addDep, replace);
final AtomicReference<TesterResults> res = new AtomicReference<TesterResults>();
thread = new Thread() {
Object fooLock = new Object();
TesterTask task = null;
ProgressTesterTaskRunner runner = null;
public void run() {
synchronized (fooLock) {
if (progressFunct != null)
progressFunct.invoke(new Progress("building task", 0, 1));
task = new TesterTask(buildStudentFileset("studentFolder"), new File(tester), testerName, addDep, name, millisPerTest, millisTotal);
runner = new ProgressTesterTaskRunner(task, progressFunct);
}
runner.compile();
runner.run();
res.set(runner.getResults());
}
public void interrupt() {
synchronized (fooLock) {
if (runner != null)
runner.stop();
}
}
};
thread.start();
while (thread.isAlive()) {
try {
thread.join();
} catch (InterruptedException ex) {
thread.interrupt();
continue;
}
}
if (res.get() != null)
res.get().writeResultsToFile(new File(resultsFile), 3, true);
ExecuteAfterThisThreadThread after = new ExecuteAfterThisThreadThread(Thread.currentThread(), new ZeroArgumentFunctor<Void>() {
public Void invoke() {
finishedFunct.invoke(TesterScript.this, res.get());
return null;
}
});
thread = null;
after.start();
}
public Set<StudentFiles> buildStudentFileset(String foo) {
Set<StudentFiles> set = new HashSet<StudentFiles>();
File[] studentFolders = new File(foo).listFiles(DirectoryFileFilter.instance().asFileFilter());
for (int i = 0; i < studentFolders.length; i++) {
set.add(new StudentFiles(studentFolders[i]));
}
return set;
}
private Set<File> buildAddDepFileset(Set<String> foo) {
return new HashSet<File>();
}
public UUID id() {
return id;
}
public String name() {
return name;
}
public void write(String filename) {
write(new File(filename));
}
private void write(File file) {
if (file.exists() && !file.isFile())
throw new IllegalArgumentException("not a regular file: "+file);
if (file.exists() && !FileUtils.isEmpty(file)) {
new File(file.getPath()+".old").delete();
file.renameTo(new File(file.getPath()+".old"));
file.delete();
}
final String NEWLINE = "\n";
try {
FileWriter w = new FileWriter(file);
w.write("JTTNG-Script/1.0"+NEWLINE);
w.write("Script-ID: "+id().toString()+NEWLINE);
w.write("Script-Name: "+name()+NEWLINE);
w.write("Folder-of-Student-Folders: "+folderOfStudentFolders()+NEWLINE);
w.write("Tester-Path: "+testerFile()+NEWLINE);
w.write("Tester-Binary-Name: "+testerBinaryName()+NEWLINE);
w.write("Additional-Dependencies-Length: "+"1"+NEWLINE);
w.write("Additional-Dependencies: "+addDep+NEWLINE);
w.write("Results-Path: "+resultsFile+NEWLINE);
w.write("Per-Test-Timeout: "+millisPerTest+NEWLINE);
w.write("Total-Timeout: "+millisTotal+NEWLINE);
w.close();
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
public boolean hasSubtests() {
return false;
}
public List<Testable> subtests() {
return Collections.emptyList();
}
public synchronized void stop() {
if (thread != null && thread.isAlive())
thread.interrupt();
}
public String resultFile() {
return resultsFile;
}
public String folderOfStudentFolders() {
return studentFolder;
}
public String testerFile() {
return tester;
}
public String testerBinaryName() {
return testerName;
}
public String additionalDependencies() {
return addDep;
}
public int millisPerTest() {
return millisPerTest;
}
public int millisTotal() {
return millisTotal;
}
@Override
public boolean equals(Object o) {
if (!(o instanceof TesterScript))
return false;
return id().equals(((TesterScript)o).id());
}
@Override
public int hashCode() {
return id().hashCode();
}
@Override
public String toString() {
return name();
}
@Override
public TesterScript clone() {
return new TesterScript(name(), folderOfStudentFolders(), testerFile(), testerBinaryName(), additionalDependencies(), millisPerTest(), millisTotal(), id(), resultFile());
}
private String doReplacement(String foo, Map<String, String> replace) {
for (Map.Entry<String, String> e : replace.entrySet())
foo = foo.replace(e.getKey(), e.getValue());
return foo;
}
public boolean canWriteResults(Map<String, String> replace) {
FileOutputStream os = null;
boolean retval = true;
try {
os = new FileOutputStream(doReplacement(resultFile(), replace));
} catch (IOException e) {
e.printStackTrace();
retval = false;
} finally {
if (os != null)
try {
os.close();
} catch (IOException ex) {}
}
return retval;
}
}
File[] studentFolders = new File(foo).listFiles(DirectoryFileFilter.instance().asFileFilter());
for (int i = 0; i < studentFolders.length; i++) {
File[] studentFolders = new File(foo).listFiles(DirectoryFileFilter.instance().asFileFilter());