使用Windows shell运行后，我的Java程序似乎挂起了。我不明白如何解决这个错误：
C:\quadrantRDBTemplate>java -cp iucbrf.jar;mysql-connector-java-5.0.jar edu.indi
ana.iucbrf.examples.quadrantRDBTemplate.QuadrantTestClassRDB > log.txt
Exception in thread "Thread-3" java.lang.RuntimeException: java.lang.RuntimeExce
ption: java.io.EOFException
at edu.indiana.util.Base64Tools.decode(Base64Tools.java:58)
at edu.indiana.iucbrf.feature.featurespec.FeatureSpecRDB.setAllFeatureSp
ecShellsIntoCache(FeatureSpecRDB.java:238)
at edu.indiana.iucbrf.feature.featurespec.FeatureSpecRDB.readFeatureSpec
RDBIntoCache(FeatureSpecRDB.java:201)
at edu.indiana.iucbrf.feature.featurespec.FeatureSpecRDB.doThreadedOpera
tion(FeatureSpecRDB.java:189)
at edu.indiana.util.multithreaded.DBLoaderThread.run(DBLoaderThread.java
:57)
at java.lang.Thread.run(Unknown Source)
编辑： 这是我修改为访问MySQL的2个文件源代码部分，其他部分是未触及的：
QuadrantSystemRDB.java
package edu.indiana.iucbrf.examples.quadrantRDBTemplate;
import edu.indiana.iucbrf.feature.FeatureKey;
import edu.indiana.iucbrf.maintenance.NullMaintenance;
import edu.indiana.iucbrf.retrieval.Retrieval;
import edu.indiana.iucbrf.retrieval.kNN;
import edu.indiana.iucbrf.adaptation.DistanceWeightedAdapter;
import edu.indiana.iucbrf.performancemonitor.PerformanceMonitor;
import edu.indiana.iucbrf.problem.ProblemGenerator;
import edu.indiana.iucbrf.casepackage.CaseGenerator;
import edu.indiana.iucbrf.casebase.FlatCaseBase;
import edu.indiana.iucbrf.cbrsystem.CBRSystem;
import edu.indiana.util.distribution.UniformDistribution;
import java.util.HashMap;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Map;
import edu.indiana.iucbrf.casebase.RDBCaseBase;
import edu.indiana.iucbrf.feature.featurespec.FeatureSpecCollection;
import edu.indiana.iucbrf.feature.FeatureCollection;
import edu.indiana.iucbrf.feature.featurespec.FeatureSpecRDBInfo;
import edu.indiana.util.db.JDBCDriverInfo;
import edu.indiana.iucbrf.casebase.RDBCaseBaseInfo;
import edu.indiana.iucbrf.domain.DBInfo;
public class QuadrantSystemRDB
extends CBRSystem {
///////////////////////////////////////////////////////////////////////////
// Database configuration
public static final String USERNAME;
public static final String PASSWORD;
//public static final String HOST_NAME;
//public static final String SERVICE_NAME;
/* Set the above variables appropriately for your database configuration. Additional
* code modifications may also be necessary depending on your configuration.
*/
static {
//if (true)
// throw new UnsupportedOperationException("\n\n*************** NOTICE ***************\nThis exception is expected! You must set a few constants in QuadrantSystemRDB, according to your database configuration, and then comment out this exception.");
USERNAME = "root";
PASSWORD = "123456";
// HOST_NAME = "localhost";
// SERVICE_NAME = "";
}
///////////////////////////////////////////////////////////////////////////
/** The number of cases to be in the case base. Of course, performance of
* the system depends on how many cases are available.
*/
private static final int NUM_CASES = 5;
/** The keys to the two problem features. */
private FeatureKey xKey;
private FeatureKey yKey;
DBInfo dbInfo;
FeatureSpecRDBInfo problemSpecInfo;
FeatureSpecRDBInfo solutionSpecInfo;
RDBCaseBaseInfo rdbCasebaseInfo;
/** Creates a new instance of QuadrantSystem */
public QuadrantSystemRDB() {
//Defines the required info classes
//setupInfo();
try {
setupInfo();
}
catch (java.sql.SQLException e) {
// you may want to do something useful here
// maybe even throw new RuntimException();
}
// Define the domain, which describes the type of problems the system will solve.
setupDomain();
// Create the case base and add cases to it.
setupCaseBase();
// Do no maintenance for this system
setMaintenance(new NullMaintenance());
// Retrieval will be 5-nearest neighbor
Retrieval retrieval = new kNN(getDomain().getProblemDifferentiator(), 5);
setRetrieval(retrieval);
// The adaptation technique is a distance-weighted majority vote.
setAdaptation(new DistanceWeightedAdapter("edu.indiana.iucbrf.adaptation.WeightedMajorityAdapter"));
// Track the system performance with the performance monitor
setPerformanceMonitor(new PerformanceMonitor());
}
private void setupInfo() throws SQLException
{
Driver driver = new com.mysql.jdbc.Driver();
String url = "jdbc:mysql://localhost:3306/hpdata";
String username = USERNAME;
String password = PASSWORD;
String problemFeatureSpecTableName = "ProblemFeatureSpec";
String solutionFeatureSpectTableName = "SolutionFeatureSpec";
String classTableName = "Class";
String extraDataTableName = "ExtraData";
String casebaseTablename = "CaseBase";
String problemTableName = "Problem";
String solutionTableName = "Solution";
String inactiveContextsTableName = "InactiveContext";
String constantsTableName = "Constants";
dbInfo = new DBInfo(new JDBCDriverInfo(driver, url, username, password),constantsTableName);
problemSpecInfo = new FeatureSpecRDBInfo(problemFeatureSpecTableName, classTableName, extraDataTableName);
solutionSpecInfo = new FeatureSpecRDBInfo(solutionFeatureSpectTableName, classTableName, extraDataTableName);
rdbCasebaseInfo = new RDBCaseBaseInfo(casebaseTablename, solutionTableName, problemTableName, inactiveContextsTableName);
}
// Define the domain, which describes the type of problems the system will solve.
private void setupDomain() {
QuadrantDomainRDB domain = new QuadrantDomainRDB(dbInfo, problemSpecInfo, solutionSpecInfo);
/* Add the two problem features: x and y. The textual description,
* type, and similarity weight are specified. The return values are keys
* that will be referred to in additional setup steps.
*/
long start, end, totalTime;
start = System.currentTimeMillis();
xKey = domain.addProblemFeature("x", "edu.indiana.iucbrf.feature.DoubleFeature", 1, true);
end = System.currentTimeMillis();
totalTime = end - start;
System.out.println("Total Time to add a featurespec: " + totalTime + " in millisec");
FeatureSpecCollection fsc = domain.getFeatureSpecCollection(FeatureCollection.PROBLEM_FEATURE_COLLECTION);
start = System.currentTimeMillis();
fsc.getFeatureSpec(xKey);
end = System.currentTimeMillis();
totalTime = end - start;
System.out.println("Total Time to get a featurespec: " + totalTime + " in millisec");
yKey = domain.addProblemFeature("y", "edu.indiana.iucbrf.feature.DoubleFeature", 1, true);
/* Add the solution feature: quadrant. A key is assigned, but it is not
* needed at this time.
*/
domain.addSolutionFeature("Quadrant", "edu.indiana.iucbrf.feature.IntegerFeature");
/* The reference solution for this domain requires the xKey and yKey. See
introductory paper for details on reference methods. */
domain.prepareReferenceSolution(xKey, yKey);
setDomain(domain);
}
/** The case base must be populated. For this example, random generation is
* possible and sufficient.
*/
private void setupCaseBase() {
// The case generator can be built from the problem generator.
CaseGenerator cg = new CaseGenerator(constructProblemGenerator(), getDomain());
/** Construct the case base, with a simple flat structure. For this
* constructor, the case generator and the desired number of initial cases
* can be passed.
*/
long start;
long end;
long totalTime;
start = System.currentTimeMillis();
setCB(new RDBCaseBase(getDomain(), rdbCasebaseInfo, cg, NUM_CASES));
end = System.currentTimeMillis();
totalTime = end - start;
System.out.println("Total Time to setup casebase with " + NUM_CASES + " : " + totalTime + " in millisec");
}
/** A problem generator requires specification of arguments to send to
* feature constructors. Here, random distributions are used.
*/
public ProblemGenerator constructProblemGenerator() {
HashMap argMap = new HashMap(2);
argMap.put(xKey, new UniformDistribution(-1, 1));
argMap.put(yKey, new UniformDistribution(-1, 1));
return new ProblemGenerator(argMap, getDomain());
}
}
QuadrantTestClassRDB.java
package edu.indiana.iucbrf.examples.quadrantRDBTemplate;
import edu.indiana.iucbrf.problem.Problem;
import java.sql.Driver;
import java.io.IOException;
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.Statement;
/**
* This class contains a simple main method that constructs a QuadrantSystemRDB
* and tests it on a single problem. This demonstrates basic database functionality.
* In order to run this program, you will need to configure your database
* (edu/creation_script.sql may be helpful in this task) and perhaps
* modify the settings here accordingly. You will also need to set some parameters as
* discussed in QuadrantSystemRDB.
*
* @author Steven Bogaerts
*/
public class QuadrantTestClassRDB {
/** Constructs the system, and tests it on a single problem. */
public static void main(String[] args) {
System.out.println("Hello World! ...... ");
flush();
long start, end, totalTime;
// Construct the system.
start = System.currentTimeMillis();
QuadrantSystemRDB sys = new QuadrantSystemRDB();
end = System.currentTimeMillis();
totalTime = end - start;
System.out.println("Total Time to construct system: " + totalTime + " in millisec");
// Set the system to show a GUI of its status.
sys.setGUIMode(true);
/* Generate a problem to test the system on. This problem generator is
defined in the QuadrantSystem class. */
start = System.currentTimeMillis();
Problem p = sys.constructProblemGenerator().generateProblem();
end = System.currentTimeMillis();
totalTime = end - start;
System.out.println("Total Time to generate a problem: " + totalTime + " in millisec");
// Solve the problem. The GUI will show what happens.
start = System.currentTimeMillis();
sys.solve(p);
sys.close();
end = System.currentTimeMillis();
totalTime = end - start;
System.out.println("Total Time to solve a problem: " + totalTime + " in millisec");
}
private static void flush() {
String url = "jdbc:mysql://localhost:3306/hpdata";
Connection con;
Statement stmt;
String query1 = "Delete from casebase";
String query2 = "Delete from problem";
String query3 = "Delete from solution";
String query4 = "Delete from problemfeaturespec";
String query5 = "Delete from solutionfeaturespec";
String query6 = "Delete from inactivecontext";
String query7 = "Delete from class";
String query8 = "Delete from extradata";
try {
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
// DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
} catch (Exception e) {
System.out.println("Class Not Found Exception:");
System.out.println(e.getMessage());
}
try {
con = DriverManager.getConnection(url, QuadrantSystemRDB.USERNAME, QuadrantSystemRDB.PASSWORD);
stmt = con.createStatement();
System.out.println("Deleting Tables from Database...");
System.out.println("casebase...");
stmt.executeUpdate(query1);
System.out.println("deleted\n");
System.out.println("problem...");
stmt.executeUpdate(query2);
System.out.println("deleted\n");
System.out.println("solution...");
stmt.executeUpdate(query3);
System.out.println("deleted\n");
System.out.println("problemfeaturespec...");
stmt.executeUpdate(query4);
System.out.println("deleted\n");
System.out.println("solutionfeaturespec...");
stmt.executeUpdate(query5);
System.out.println("deleted\n");
System.out.println("inactivecontext...");
stmt.executeUpdate(query6);
System.out.println("deleted\n");
System.out.println("class...");
stmt.executeUpdate(query7);
System.out.println("deleted\n");
System.out.println("extradata...");
stmt.executeUpdate(query8);
System.out.println("deleted\n");
stmt.close();
con.close();
} catch (Exception e) {
System.out.println("SQLException:" + e.getMessage());
e.printStackTrace();
}
}
}
答案 0 :(得分：0)
看起来你有一个后台线程崩溃（读取Base64数据时意外的文件结束），程序可能没有处理这个，而是等待（无限期地）让线程返回一些结果。
尝试修复输入数据，然后（如果是你的程序），添加一些错误处理（即捕获异常并通知程序没有数据可读）。