最近在开发的时候，遇到一个小问题：
Caused by: org.apache.ibatis.reflection.ReflectionException: There is no getter for property named 'DomainID' in 'class java.lang.Integer'
这是 mybatis 源文件
1 public ABLayer GetInfos(final int DomainID) { 2
3 return sqlSession.selectOne("abLayer.GetInfos",DomainID);
4 }
<!---->
<select id="GetInfos" parameterType="java.lang.Integer" resultMap="ABLayer">
select *
from ab_layer
<where>
<if test="DomainID != null and DomainID !='' ">
DomainID=#{DomainID}
</if>
</where>
order by ID
</select>
分析：
当我去掉<if>条件之后
<where>
<if test="DomainID != null and DomainID !='' ">
DomainID=#{DomainId}
</if>
</where>
有可以正常运行.仔细debug了一下源码并查看了一下官方文档，发现Mybatis解析使用的ognl表达式，我们知道ognl的上下文OgnlContext使用的时候Map接口
1 public class OgnlContext implements Map { 2 public static final String CONTEXT_CONTEXT_KEY = "context"; 3 public static final String ROOT_CONTEXT_KEY = "root"; 4 public static final String THIS_CONTEXT_KEY = "this"; 5 public static final String TRACE_EVALUATIONS_CONTEXT_KEY = "_traceEvaluations"; 6 public static final String LAST_EVALUATION_CONTEXT_KEY = "_lastEvaluation"; 7 public static final String KEEP_LAST_EVALUATION_CONTEXT_KEY = "_keepLastEvaluation"; 8 public static final String CLASS_RESOLVER_CONTEXT_KEY = "_classResolver"; 9 public static final String TYPE_CONVERTER_CONTEXT_KEY = "_typeConverter"; 10 public static final String MEMBER_ACCESS_CONTEXT_KEY = "_memberAccess"; 11 private static final String PROPERTY_KEY_PREFIX = "ognl";
并且OgnlRutime中包含了许多的Bean类型，在源码中可以看到
1 // 2 // Source code recreated from a .class file by IntelliJ IDEA 3 // (powered by Fernflower decompiler) 4 // 5 6 package org.apache.ibatis.ognl; 7 8 import java.beans.IndexedPropertyDescriptor; 9 import java.beans.IntrospectionException; 10 import java.beans.Introspector; 11 import java.beans.PropertyDescriptor; 12 import java.lang.reflect.Constructor; 13 import java.lang.reflect.Field; 14 import java.lang.reflect.InvocationTargetException; 15 import java.lang.reflect.Member; 16 import java.lang.reflect.Method; 17 import java.lang.reflect.Modifier; 18 import java.lang.reflect.Proxy; 19 import java.math.BigDecimal; 20 import java.math.BigInteger; 21 import java.security.Permission; 22 import java.util.ArrayList; 23 import java.util.Arrays; 24 import java.util.Collections; 25 import java.util.HashMap; 26 import java.util.Iterator; 27 import java.util.List; 28 import java.util.Map; 60 public abstract class OgnlRuntime { 61 public static final Object NotFound = new Object(); 62 public static final List NotFoundList = new ArrayList(); 63 public static final Map NotFoundMap = new HashMap(); 64 public static final Object[] NoArguments = new Object[0]; 65 public static final Class[] NoArgumentTypes = new Class[0]; 66 public static final Object NoConversionPossible = "org.apache.ibatis.ognl.NoConversionPossible"; 67 public static int INDEXED_PROPERTY_NONE = 0; 68 public static int INDEXED_PROPERTY_INT = 1; 69 public static int INDEXED_PROPERTY_OBJECT = 2; 70 public static final String NULL_STRING = "" + null; 71 private static final String SET_PREFIX = "set"; 72 private static final String GET_PREFIX = "get"; 73 private static final String IS_PREFIX = "is"; 74 private static final Map HEX_PADDING = new HashMap(); 75 private static final String HEX_PREFIX = "0x"; 76 private static final int HEX_LENGTH = 8; 77 private static final String NULL_OBJECT_STRING = "<null>"; 78 private static OgnlRuntime.ClassCache methodAccessors = new OgnlRuntime.ClassCache(); 79 private static OgnlRuntime.ClassCache propertyAccessors = new OgnlRuntime.ClassCache(); 80 private static OgnlRuntime.ClassCache elementsAccessors = new OgnlRuntime.ClassCache(); 81 private static OgnlRuntime.ClassCache nullHandlers = new OgnlRuntime.ClassCache(); 82 private static OgnlRuntime.ClassCache propertyDescriptorCache = new OgnlRuntime.ClassCache(); 83 private static OgnlRuntime.ClassCache constructorCache = new OgnlRuntime.ClassCache(); 84 private static OgnlRuntime.ClassCache staticMethodCache = new OgnlRuntime.ClassCache(); 85 private static OgnlRuntime.ClassCache instanceMethodCache = new OgnlRuntime.ClassCache(); 86 private static OgnlRuntime.ClassCache invokePermissionCache = new OgnlRuntime.ClassCache(); 87 private static OgnlRuntime.ClassCache fieldCache = new OgnlRuntime.ClassCache(); 88 private static List superclasses = new ArrayList(); 89 private static OgnlRuntime.ClassCache[] declaredMethods = new OgnlRuntime.ClassCache[]{new OgnlRuntime.ClassCache(), new OgnlRuntime.ClassCache()}; 90 private static Map primitiveTypes = new HashMap(101); 91 private static OgnlRuntime.ClassCache primitiveDefaults = new OgnlRuntime.ClassCache(); 92 private static Map methodParameterTypesCache = new HashMap(101); 93 private static Map ctorParameterTypesCache = new HashMap(101); 94 private static SecurityManager securityManager = System.getSecurityManager(); 95 private static EvaluationPool evaluationPool = new EvaluationPool(); 96 private static ObjectArrayPool objectArrayPool = new ObjectArrayPool(); 97 98 static { 99 ArrayPropertyAccessor p = new ArrayPropertyAccessor(); 100 Class var10000 = class$0; 101 if(class$0 == null) { 102 try { 103 var10000 = Class.forName("java.lang.Object"); 104 } catch (ClassNotFoundException var51) { 105 throw new NoClassDefFoundError(var51.getMessage()); 106 } 107 108 class$0 = var10000; 109 } 110 111 setPropertyAccessor(var10000, new ObjectPropertyAccessor()); 112 var10000 = class$1; 113 if(class$1 == null) { 114 try { 115 var10000 = Class.forName("[B"); 116 } catch (ClassNotFoundException var50) { 117 throw new NoClassDefFoundError(var50.getMessage()); 118 } 119 120 class$1 = var10000; 121 } 122 123 setPropertyAccessor(var10000, p); 124 var10000 = class$2; 125 if(class$2 == null) { 126 try { 127 var10000 = Class.forName("[S"); 128 } catch (ClassNotFoundException var49) { 129 throw new NoClassDefFoundError(var49.getMessage()); 130 } 131 132 class$2 = var10000; 133 } 134 135 setPropertyAccessor(var10000, p); 136 var10000 = class$3; 137 if(class$3 == null) { 138 try { 139 var10000 = Class.forName("[C"); 140 } catch (ClassNotFoundException var48) { 141 throw new NoClassDefFoundError(var48.getMessage()); 142 } 143 144 class$3 = var10000; 145 } 146 147 setPropertyAccessor(var10000, p); 148 var10000 = class$4; 149 if(class$4 == null) { 150 try { 151 var10000 = Class.forName("[I"); 152 } catch (ClassNotFoundException var47) { 153 throw new NoClassDefFoundError(var47.getMessage()); 154 } 155 156 class$4 = var10000; 157 } 158 159 setPropertyAccessor(var10000, p); 160 var10000 = class$5; 161 if(class$5 == null) { 162 try { 163 var10000 = Class.forName("[J"); 164 } catch (ClassNotFoundException var46) { 165 throw new NoClassDefFoundError(var46.getMessage()); 166 } 167 168 class$5 = var10000; 169 } 170 171 setPropertyAccessor(var10000, p); 172 var10000 = class$6; 173 if(class$6 == null) { 174 try { 175 var10000 = Class.forName("[F"); 176 } catch (ClassNotFoundException var45) { 177 throw new NoClassDefFoundError(var45.getMessage()); 178 } 179 180 class$6 = var10000; 181 } 182 183 setPropertyAccessor(var10000, p); 184 var10000 = class$7; 185 if(class$7 == null) { 186 try { 187 var10000 = Class.forName("[D"); 188 } catch (ClassNotFoundException var44) { 189 throw new NoClassDefFoundError(var44.getMessage()); 190 } 191 192 class$7 = var10000; 193 } 194 195 setPropertyAccessor(var10000, p); 196 var10000 = class$8; 197 if(class$8 == null) { 198 try { 199 var10000 = Class.forName("[Ljava.lang.Object;"); 200 } catch (ClassNotFoundException var43) { 201 throw new NoClassDefFoundError(var43.getMessage()); 202 } 203 204 class$8 = var10000; 205 } 206 207 setPropertyAccessor(var10000, p); 208 var10000 = class$9; 209 if(class$9 == null) { 210 try { 211 var10000 = Class.forName("java.util.List"); 212 } catch (ClassNotFoundException var42) { 213 throw new NoClassDefFoundError(var42.getMessage()); 214 } 215 216 class$9 = var10000; 217 } 218 219 setPropertyAccessor(var10000, new ListPropertyAccessor()); 220 var10000 = class$10; 221 if(class$10 == null) { 222 try { 223 var10000 = Class.forName("java.util.Map"); 224 } catch (ClassNotFoundException var41) { 225 throw new NoClassDefFoundError(var41.getMessage()); 226 } 227 228 class$10 = var10000; 229 } 230 231 setPropertyAccessor(var10000, new MapPropertyAccessor()); 232 var10000 = class$11; 233 if(class$11 == null) { 234 try { 235 var10000 = Class.forName("java.util.Set"); 236 } catch (ClassNotFoundException var40) { 237 throw new NoClassDefFoundError(var40.getMessage()); 238 } 239 240 class$11 = var10000; 241 } 242 243 setPropertyAccessor(var10000, new SetPropertyAccessor()); 244 var10000 = class$12; 245 if(class$12 == null) { 246 try { 247 var10000 = Class.forName("java.util.Iterator"); 248 } catch (ClassNotFoundException var39) { 249 throw new NoClassDefFoundError(var39.getMessage()); 250 } 251 252 class$12 = var10000; 253 } 254 255 setPropertyAccessor(var10000, new IteratorPropertyAccessor()); 256 var10000 = class$13; 257 if(class$13 == null) { 258 try { 259 var10000 = Class.forName("java.util.Enumeration"); 260 } catch (ClassNotFoundException var38) { 261 throw new NoClassDefFoundError(var38.getMessage()); 262 } 263 264 class$13 = var10000; 265 } 266 267 setPropertyAccessor(var10000, new EnumerationPropertyAccessor()); 268 ArrayElementsAccessor e = new ArrayElementsAccessor(); 269 var10000 = class$0; 270 if(class$0 == null) { 271 try { 272 var10000 = Class.forName("java.lang.Object"); 273 } catch (ClassNotFoundException var37) { 274 throw new NoClassDefFoundError(var37.getMessage()); 275 } 276 277 class$0 = var10000; 278 } 279 280 setElementsAccessor(var10000, new ObjectElementsAccessor()); 281 var10000 = class$1; 282 if(class$1 == null) { 283 try { 284 var10000 = Class.forName("[B"); 285 } catch (ClassNotFoundException var36) { 286 throw new NoClassDefFoundError(var36.getMessage()); 287 } 288 289 class$1 = var10000; 290 } 291 292 setElementsAccessor(var10000, e); 293 var10000 = class$2; 294 if(class$2 == null) { 295 try { 296 var10000 = Class.forName("[S"); 297 } catch (ClassNotFoundException var35) { 298 throw new NoClassDefFoundError(var35.getMessage()); 299 } 300 301 class$2 = var10000; 302 } 303 304 setElementsAccessor(var10000, e); 305 var10000 = class$3; 306 if(class$3 == null) { 307 try { 308 var10000 = Class.forName("[C"); 309 } catch (ClassNotFoundException var34) { 310 throw new NoClassDefFoundError(var34.getMessage()); 311 } 312 313 class$3 = var10000; 314 } 315 316 setElementsAccessor(var10000, e); 317 var10000 = class$4; 318 if(class$4 == null) { 319 try { 320 var10000 = Class.forName("[I"); 321 } catch (ClassNotFoundException var33) { 322 throw new NoClassDefFoundError(var33.getMessage()); 323 } 324 325 class$4 = var10000; 326 } 327 328 setElementsAccessor(var10000, e); 329 var10000 = class$5; 330 if(class$5 == null) { 331 try { 332 var10000 = Class.forName("[J"); 333 } catch (ClassNotFoundException var32) { 334 throw new NoClassDefFoundError(var32.getMessage()); 335 } 336 337 class$5 = var10000; 338 } 339 340 setElementsAccessor(var10000, e); 341 var10000 = class$6; 342 if(class$6 == null) { 343 try { 344 var10000 = Class.forName("[F"); 345 } catch (ClassNotFoundException var31) { 346 throw new NoClassDefFoundError(var31.getMessage()); 347 } 348 349 class$6 = var10000; 350 } 351 352 setElementsAccessor(var10000, e); 353 var10000 = class$7; 354 if(class$7 == null) { 355 try { 356 var10000 = Class.forName("[D"); 357 } catch (ClassNotFoundException var30) { 358 throw new NoClassDefFoundError(var30.getMessage()); 359 } 360 361 class$7 = var10000; 362 } 363 364 setElementsAccessor(var10000, e); 365 var10000 = class$8; 366 if(class$8 == null) { 367 try { 368 var10000 = Class.forName("[Ljava.lang.Object;"); 369 } catch (ClassNotFoundException var29) { 370 throw new NoClassDefFoundError(var29.getMessage()); 371 } 372 373 class$8 = var10000; 374 } 375 376 setElementsAccessor(var10000, e); 377 var10000 = class$14; 378 if(class$14 == null) { 379 try { 380 var10000 = Class.forName("java.util.Collection"); 381 } catch (ClassNotFoundException var28) { 382 throw new NoClassDefFoundError(var28.getMessage()); 383 } 384 385 class$14 = var10000; 386 } 387 388 setElementsAccessor(var10000, new CollectionElementsAccessor()); 389 var10000 = class$10; 390 if(class$10 == null) { 391 try { 392 var10000 = Class.forName("java.util.Map"); 393 } catch (ClassNotFoundException var27) { 394 throw new NoClassDefFoundError(var27.getMessage()); 395 } 396 397 class$10 = var10000; 398 } 399 400 setElementsAccessor(var10000, new MapElementsAccessor()); 401 var10000 = class$12; 402 if(class$12 == null) { 403 try { 404 var10000 = Class.forName("java.util.Iterator"); 405 } catch (ClassNotFoundException var26) { 406 throw new NoClassDefFoundError(var26.getMessage()); 407 } 408 409 class$12 = var10000; 410 } 411 412 setElementsAccessor(var10000, new IteratorElementsAccessor()); 413 var10000 = class$13; 414 if(class$13 == null) { 415 try { 416 var10000 = Class.forName("java.util.Enumeration"); 417 } catch (ClassNotFoundException var25) { 418 throw new NoClassDefFoundError(var25.getMessage()); 419 } 420 421 class$13 = var10000; 422 } 423 424 setElementsAccessor(var10000, new EnumerationElementsAccessor()); 425 var10000 = class$15; 426 if(class$15 == null) { 427 try { 428 var10000 = Class.forName("java.lang.Number"); 429 } catch (ClassNotFoundException var24) { 430 throw new NoClassDefFoundError(var24.getMessage()); 431 } 432 433 class$15 = var10000; 434 } 435 436 setElementsAccessor(var10000, new NumberElementsAccessor()); 437 ObjectNullHandler nh = new ObjectNullHandler(); 438 var10000 = class$0; 439 if(class$0 == null) { 440 try { 441 var10000 = Class.forName("java.lang.Object"); 442 } catch (ClassNotFoundException var23) { 443 throw new NoClassDefFoundError(var23.getMessage()); 444 } 445 446 class$0 = var10000; 447 } 448 449 setNullHandler(var10000, nh); 450 var10000 = class$1; 451 if(class$1 == null) { 452 try { 453 var10000 = Class.forName("[B"); 454 } catch (ClassNotFoundException var22) { 455 throw new NoClassDefFoundError(var22.getMessage()); 456 } 457 458 class$1 = var10000; 459 } 460 461 setNullHandler(var10000, nh); 462 var10000 = class$2; 463 if(class$2 == null) { 464 try { 465 var10000 = Class.forName("[S"); 466 } catch (ClassNotFoundException var21) { 467 throw new NoClassDefFoundError(var21.getMessage()); 468 } 469 470 class$2 = var10000; 471 } 472 473 setNullHandler(var10000, nh); 474 var10000 = class$3; 475 if(class$3 == null) { 476 try { 477 var10000 = Class.forName("[C"); 478 } catch (ClassNotFoundException var20) { 479 throw new NoClassDefFoundError(var20.getMessage()); 480 } 481 482 class$3 = var10000; 483 } 484 485 setNullHandler(var10000, nh); 486 var10000 = class$4; 487 if(class$4 == null) { 488 try { 489 var10000 = Class.forName("[I"); 490 } catch (ClassNotFoundException var19) { 491 throw new NoClassDefFoundError(var19.getMessage()); 492 } 493 494 class$4 = var10000; 495 } 496 497 setNullHandler(var10000, nh); 498 var10000 = class$5; 499 if(class$5 == null) { 500 try { 501 var10000 = Class.forName("[J"); 502 } catch (ClassNotFoundException var18) { 503 throw new NoClassDefFoundError(var18.getMessage()); 504 } 505 506 class$5 = var10000; 507 } 508 509 setNullHandler(var10000, nh); 510 var10000 = class$6; 511 if(class$6 == null) { 512 try { 513 var10000 = Class.forName("[F"); 514 } catch (ClassNotFoundException var17) { 515 throw new NoClassDefFoundError(var17.getMessage()); 516 } 517 518 class$6 = var10000; 519 } 520 521 setNullHandler(var10000, nh); 522 var10000 = class$7; 523 if(class$7 == null) { 524 try { 525 var10000 = Class.forName("[D"); 526 } catch (ClassNotFoundException var16) { 527 throw new NoClassDefFoundError(var16.getMessage()); 528 } 529 530 class$7 = var10000; 531 } 532 533 setNullHandler(var10000, nh); 534 var10000 = class$8; 535 if(class$8 == null) { 536 try { 537 var10000 = Class.forName("[Ljava.lang.Object;"); 538 } catch (ClassNotFoundException var15) { 539 throw new NoClassDefFoundError(var15.getMessage()); 540 } 541 542 class$8 = var10000; 543 } 544 545 setNullHandler(var10000, nh); 546 ObjectMethodAccessor ma = new ObjectMethodAccessor(); 547 var10000 = class$0; 548 if(class$0 == null) { 549 try { 550 var10000 = Class.forName("java.lang.Object"); 551 } catch (ClassNotFoundException var14) { 552 throw new NoClassDefFoundError(var14.getMessage()); 553 } 554 555 class$0 = var10000; 556 } 557 558 setMethodAccessor(var10000, ma); 559 var10000 = class$1; 560 if(class$1 == null) { 561 try { 562 var10000 = Class.forName("[B"); 563 } catch (ClassNotFoundException var13) { 564 throw new NoClassDefFoundError(var13.getMessage()); 565 } 566 567 class$1 = var10000; 568 } 569 570 setMethodAccessor(var10000, ma); 571 var10000 = class$2; 572 if(class$2 == null) { 573 try { 574 var10000 = Class.forName("[S"); 575 } catch (ClassNotFoundException var12) { 576 throw new NoClassDefFoundError(var12.getMessage()); 577 } 578 579 class$2 = var10000; 580 } 581 582 setMethodAccessor(var10000, ma); 583 var10000 = class$3; 584 if(class$3 == null) { 585 try { 586 var10000 = Class.forName("[C"); 587 } catch (ClassNotFoundException var11) { 588 throw new NoClassDefFoundError(var11.getMessage()); 589 } 590 591 class$3 = var10000; 592 } 593 594 setMethodAccessor(var10000, ma); 595 var10000 = class$4; 596 if(class$4 == null) { 597 try { 598 var10000 = Class.forName("[I"); 599 } catch (ClassNotFoundException var10) { 600 throw new NoClassDefFoundError(var10.getMessage()); 601 } 602 603 class$4 = var10000; 604 } 605 606 setMethodAccessor(var10000, ma); 607 var10000 = class$5; 608 if(class$5 == null) { 609 try { 610 var10000 = Class.forName("[J"); 611 } catch (ClassNotFoundException var9) { 612 throw new NoClassDefFoundError(var9.getMessage()); 613 } 614 615 class$5 = var10000; 616 } 617 618 setMethodAccessor(var10000, ma); 619 var10000 = class$6; 620 if(class$6 == null) { 621 try { 622 var10000 = Class.forName("[F"); 623 } catch (ClassNotFoundException var8) { 624 throw new NoClassDefFoundError(var8.getMessage()); 625 } 626 627 class$6 = var10000; 628 } 629 630 setMethodAccessor(var10000, ma); 631 var10000 = class$7; 632 if(class$7 == null) { 633 try { 634 var10000 = Class.forName("[D"); 635 } catch (ClassNotFoundException var7) { 636 throw new NoClassDefFoundError(var7.getMessage()); 637 } 638 639 class$7 = var10000; 640 } 641 642 setMethodAccessor(var10000, ma); 643 var10000 = class$8; 644 if(class$8 == null) { 645 try { 646 var10000 = Class.forName("[Ljava.lang.Object;"); 647 } catch (ClassNotFoundException var6) { 648 throw new NoClassDefFoundError(var6.getMessage()); 649 } 650 651 class$8 = var10000; 652 } 653 654 setMethodAccessor(var10000, ma); 655 primitiveTypes.put("boolean", Boolean.TYPE); 656 primitiveTypes.put("byte", Byte.TYPE); 657 primitiveTypes.put("short", Short.TYPE); 658 primitiveTypes.put("char", Character.TYPE); 659 primitiveTypes.put("int", Integer.TYPE); 660 primitiveTypes.put("long", Long.TYPE); 661 primitiveTypes.put("float", Float.TYPE); 662 primitiveTypes.put("double", Double.TYPE); 663 primitiveDefaults.put(Boolean.TYPE, Boolean.FALSE); 664 primitiveDefaults.put(Byte.TYPE, new Byte((byte)0)); 665 primitiveDefaults.put(Short.TYPE, new Short((short)0)); 666 primitiveDefaults.put(Character.TYPE, new Character('u0000')); 667 primitiveDefaults.put(Integer.TYPE, new Integer(0)); 668 primitiveDefaults.put(Long.TYPE, new Long(0L)); 669 primitiveDefaults.put(Float.TYPE, new Float(0.0F)); 670 primitiveDefaults.put(Double.TYPE, new Double(0.0D)); 671 OgnlRuntime.ClassCache var52 = primitiveDefaults; 672 Class var10001 = class$16; 673 if(class$16 == null) { 674 try { 675 var10001 = Class.forName("java.math.BigInteger"); 676 } catch (ClassNotFoundException var5) { 677 throw new NoClassDefFoundError(var5.getMessage()); 678 } 679 680 class$16 = var10001; 681 } 682 683 var52.put(var10001, new BigInteger("0")); 684 var52 = primitiveDefaults; 685 var10001 = class$17; 686 if(class$17 == null) { 687 try { 688 var10001 = Class.forName("java.math.BigDecimal"); 689 } catch (ClassNotFoundException var4) { 690 throw new NoClassDefFoundError(var4.getMessage()); 691 } 692 693 class$17 = var10001; 694 } 695 696 var52.put(var10001, new BigDecimal(0.0D)); 697 } 698
它提供支持许多的bean类8个基本类型，还有map,list,arraylist等.然后使用对象提供的set和get来进行数据绑定.而ognl在解析xml的时候，会首先进入该源代码
public class OgnlParserTokenManager implements OgnlParserConstants { Object literalValue; private char charValue; private char charLiteralStartQuote; private StringBuffer stringBuffer; public PrintStream debugStream; static final long[] jjbitVec0 = new long[]{2301339413881290750L, -16384L, 4294967295L, 432345564227567616L}; static final long[] jjbitVec2 = new long[]{0L, 0L, 0L, -36028797027352577L}; static final long[] jjbitVec3 = new long[]{0L, -1L, -1L, -1L}; static final long[] jjbitVec4 = new long[]{-1L, -1L, 65535L, 0L}; static final long[] jjbitVec5 = new long[]{-1L, -1L, 0L, 0L}; static final long[] jjbitVec6 = new long[]{70368744177663L, 0L, 0L, 0L}; static final long[] jjbitVec7 = new long[]{-2L, -1L, -1L, -1L}; static final long[] jjbitVec8 = new long[]{0L, 0L, -1L, -1L}; static final int[] jjnextStates = new int[]{15, 16, 18, 19, 22, 13, 24, 25, 7, 9, 10, 13, 17, 10, 13, 11, 12, 20, 21, 1, 2, 3}; public static final String[] jjstrLiteralImages = new String[]{"", ",", "=", "?", ":", "||", "or", "&&", "and", "|", "bor", "^", "xor", "&", "band", "==", "eq", "!=", "neq", "<", "lt", ">", "gt", "<=", "lte", ">=", "gte", "in", "not", "<<", "shl", ">>", "shr", ">>>", "ushr", "+", "-", "*", "/", "%", "~", "!", "instanceof", ".", "(", ")", "true", "false", "null", "#this", "#root", "#", "[", "]", "{", "}", "@", "new", "$", null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null}; public static final String[] lexStateNames = new String[]{"DEFAULT", "WithinCharLiteral", "WithinBackCharLiteral", "WithinStringLiteral"};
可以看到需要#{}之类的 或者#name等才能被ognl识别，然后才能解析...,然后回到我们的这个问题
对于if语句中的 DomainID 并没有被标识符标记，因而识别不出，所以启动ognl解析的时候，会自认为他是自定义的变量，自定义它的开发者应该会编写它对应的get和set方法，所以ongl会默认的去调用该对象的set，get方法，然而
我们对Domain对象是一个java.lang.Integer对象，本身没有get,set方法。所以才会爆出开始的那些异常. 这应该就是问题所在了，然后如何解决呢？
1. 方法一：
封装一下这个元素或者使用map来封装.
//对DomainID进行封装 class myId{ private Integer DomainID； public Integer getDomainID(){ return DomainID; } public void SetDomainID(Integer id){ DomainID = id; } }
2.采用将DomainID改为 _parameter
<where> <if test="_parameter != null and _parameter !='' "> DomainID=#{_parameter} </if> </where>
3.使用@Param注解
如果我们使用的是接口Interface方式
使用
public ABLayer GetInfos( @Param(value="DomainID") Integer DomainID);
<select id="GetInfos" parameterType="java.lang.Integer" resultMap="ABLayer"> select * from ab_layer <where> <if test="DomainID != null and DomainID !='' "> DomainID=#{DomainID} </if> </where> order by ID </select>