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annotate src/org/eclipse/jetty/util/Loader.java @ 802:3428c60d7cfc

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replace jetty jars with source
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 07 Sep 2016 21:15:48 -0600
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.util;
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20
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21 import java.io.File;
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22 import java.net.URL;
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23 import java.net.URLClassLoader;
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24 import java.util.Locale;
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25 import java.util.MissingResourceException;
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26 import java.util.ResourceBundle;
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27
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28 import org.eclipse.jetty.util.resource.Resource;
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29
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30 /* ------------------------------------------------------------ */
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31 /** ClassLoader Helper.
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32 * This helper class allows classes to be loaded either from the
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33 * Thread's ContextClassLoader, the classloader of the derived class
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34 * or the system ClassLoader.
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35 *
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36 * <B>Usage:</B><PRE>
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37 * public class MyClass {
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38 * void myMethod() {
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39 * ...
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40 * Class c=Loader.loadClass(this.getClass(),classname);
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41 * ...
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42 * }
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43 * </PRE>
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44 *
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45 */
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46 public class Loader
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47 {
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48 /* ------------------------------------------------------------ */
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49 public static URL getResource(Class<?> loadClass,String name, boolean checkParents)
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50 {
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51 URL url =null;
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52 ClassLoader loader=Thread.currentThread().getContextClassLoader();
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53 while (url==null && loader!=null )
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54 {
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55 url=loader.getResource(name);
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56 loader=(url==null&&checkParents)?loader.getParent():null;
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57 }
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58
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59 loader=loadClass==null?null:loadClass.getClassLoader();
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60 while (url==null && loader!=null )
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61 {
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62 url=loader.getResource(name);
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63 loader=(url==null&&checkParents)?loader.getParent():null;
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64 }
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65
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66 if (url==null)
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67 {
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68 url=ClassLoader.getSystemResource(name);
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69 }
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70
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71 return url;
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72 }
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73
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74 /* ------------------------------------------------------------ */
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75 @SuppressWarnings("rawtypes")
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76 public static Class loadClass(Class loadClass,String name)
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77 throws ClassNotFoundException
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78 {
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79 return loadClass(loadClass,name,false);
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80 }
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81
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82 /* ------------------------------------------------------------ */
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83 /** Load a class.
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84 *
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85 * @param loadClass
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86 * @param name
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87 * @param checkParents If true, try loading directly from parent classloaders.
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88 * @return Class
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89 * @throws ClassNotFoundException
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90 */
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91 @SuppressWarnings("rawtypes")
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92 public static Class loadClass(Class loadClass,String name,boolean checkParents)
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93 throws ClassNotFoundException
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94 {
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95 ClassNotFoundException ex=null;
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96 Class<?> c =null;
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97 ClassLoader loader=Thread.currentThread().getContextClassLoader();
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98 while (c==null && loader!=null )
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99 {
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100 try { c=loader.loadClass(name); }
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101 catch (ClassNotFoundException e) {if(ex==null)ex=e;}
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102 loader=(c==null&&checkParents)?loader.getParent():null;
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103 }
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104
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105 loader=loadClass==null?null:loadClass.getClassLoader();
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106 while (c==null && loader!=null )
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107 {
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108 try { c=loader.loadClass(name); }
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109 catch (ClassNotFoundException e) {if(ex==null)ex=e;}
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110 loader=(c==null&&checkParents)?loader.getParent():null;
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111 }
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112
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113 if (c==null)
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114 {
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115 try { c=Class.forName(name); }
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116 catch (ClassNotFoundException e) {if(ex==null)ex=e;}
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117 }
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118
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119 if (c!=null)
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120 return c;
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121 throw ex;
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122 }
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123
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124
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125
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126 /* ------------------------------------------------------------ */
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127 public static ResourceBundle getResourceBundle(Class<?> loadClass,String name,boolean checkParents, Locale locale)
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128 throws MissingResourceException
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129 {
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130 MissingResourceException ex=null;
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131 ResourceBundle bundle =null;
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132 ClassLoader loader=Thread.currentThread().getContextClassLoader();
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133 while (bundle==null && loader!=null )
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134 {
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135 try { bundle=ResourceBundle.getBundle(name, locale, loader); }
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136 catch (MissingResourceException e) {if(ex==null)ex=e;}
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137 loader=(bundle==null&&checkParents)?loader.getParent():null;
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138 }
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139
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140 loader=loadClass==null?null:loadClass.getClassLoader();
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141 while (bundle==null && loader!=null )
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142 {
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143 try { bundle=ResourceBundle.getBundle(name, locale, loader); }
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144 catch (MissingResourceException e) {if(ex==null)ex=e;}
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145 loader=(bundle==null&&checkParents)?loader.getParent():null;
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146 }
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147
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148 if (bundle==null)
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149 {
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150 try { bundle=ResourceBundle.getBundle(name, locale); }
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151 catch (MissingResourceException e) {if(ex==null)ex=e;}
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152 }
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153
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154 if (bundle!=null)
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155 return bundle;
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156 throw ex;
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157 }
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158
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159
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160 /* ------------------------------------------------------------ */
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161 /**
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162 * Generate the classpath (as a string) of all classloaders
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163 * above the given classloader.
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164 *
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165 * This is primarily used for jasper.
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166 * @return the system class path
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167 */
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168 public static String getClassPath(ClassLoader loader) throws Exception
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169 {
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170 StringBuilder classpath=new StringBuilder();
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171 while (loader != null && (loader instanceof URLClassLoader))
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172 {
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173 URL[] urls = ((URLClassLoader)loader).getURLs();
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174 if (urls != null)
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175 {
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176 for (int i=0;i<urls.length;i++)
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177 {
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178 Resource resource = Resource.newResource(urls[i]);
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179 File file=resource.getFile();
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180 if (file!=null && file.exists())
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181 {
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182 if (classpath.length()>0)
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183 classpath.append(File.pathSeparatorChar);
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184 classpath.append(file.getAbsolutePath());
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185 }
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186 }
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187 }
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188 loader = loader.getParent();
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189 }
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190 return classpath.toString();
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191 }
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192 }
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193